I think gcam is doing a great job on Nokia 8 in really low light conditions, but I advise to use the standard camera in other circumstances.
Two examples:
Pictures shot inside, morning light.
One with Gcam (Tolyan's 1.4). On gcam I use HDR+ and manual focus.

And one with the standard camera (no position change!). I use HDR on, manual focus

The second series in the afternoon with filtered (direct) sunlight.
First gcam


But it is a close call! And perhaps it depends more on taste ...
I think both photographs of the standard camera are 'brighter' and the colours more true to life: wood - statuette - leaves of the orchid
Comments
Twin and HDR on? Auto or manual focus (tapping the viewfinder)?
I hope you also try my suggestions next time (shot 2) and a shot after the 'ridiculous' 3 seconds (shot 3). And compare afterwards.
Shot 1 - your settings
Shot 2 - HDR on - especially if you compare with gcam which uses HDR+ as standard setting!
Shot 3 - some people claim the picture wil be a sharp shot anyway - anyway you can immediately notice that.
My reasoning ...
Twin shot must be the best picture on Nokia in most circumstances. As the Nokia 8 was the first Nokia with a twin sensor, they must have done their utmost best to make it succeed.
Gcam is using only one sensor. So Google are doing their utmost best on one sensor. And thanks to lots of work of some people we can also try it out on Nokia 8.
HDR - most cameras nowadays use HDR tecniques. This produces another colour aspect and it may well be a sort of fashion that we all want to have much like loudspeakers these days that have a lot more bass than earlier on and don't produce a 'realistic' sound anymore these days. But people kind of like these unrealistic colours and sounds.
https://www.pocket-lint.com/phones/news/138719-dual-camera-smartphones-the-history-running-through-to-the-galaxy-note-8
https://en.wikipedia.org/wiki/High-dynamic-range_imaging
Interesting to compare would be ... three shots of a scene.
One: HDR automatic + manual focus within 3 secs
Two: HDR on + manual focus within 3 secs
(in gcam HDR+ is the standard setting)
Three: HDR on and taking the shot after the ridiculous 3 seconds
(some people claim that the shot will be sharp anyway)
About Twin - normally you would expect the Nokia 8 standard camera to take the best pictures in this mode as that is the 'new' thing they added (like Huawei). So, they will have invested most work in this.
You might expect the gcam on Nokia might be better on single (color) as the Pixel only has one sensor and they must have gathered lots of expertise there.
(https://www.pocket-lint.com/phones/news/138719-dual-camera-smartphones-the-history-running-through-to-the-galaxy-note-8)
(https://www.digitaltrends.com/photography/what-is-hdr-photography/)
https://petapixel.com/2016/09/14/20-composition-techniques-will-improve-photos/
(Other people might disagree because your picture misses the most important element of thie statue: the pregnancy. So, fortunately you have the other one too. 😎)
Have a look on
https://community.phones.nokia.com/discussion/42719/i-took-a-picture-landmark-edition/
to see photographs shot by Nokia cameras and see how well or how bad Nokia 8 camera really is.
Writing this listening to 'Nothing But a Breeze' by Jesse Winchester on Radio Paradise. Thanks to the radio.net app and Google Chromecast on my stereo. Lovely!
Unfortunately there are almost no tests available on the internet to prove this point. If you search on Google for camera tests of Nokia 8 after May 31st 2018 the only one I have found is:
https://nokiapoweruser.com/nokia-8-pro-camera-ui-demo-issues-tips-to-get-better-imaging-quality/
Nokia wasn't very helpful either. They gave a substantial camera update - a totally new app really - but 'forgot' to give a manual. They even 'forgot' to tell the customers what the new features were ... I only found a very, very short commercial explaining that you could now tweak a few pro settings.
(I hope my manual can be of some use now ...)
What you ask for in your comment are really a number of extra new features that would make the camera app better. You and I can only hope they are still working on the camera app and ask, hope or beg that these features will be added in a next update.
- the 3 sec focus and then return to the center
- when using the flash it always refocus the center and takes the wrong exposure and picture is always dark. If you use the camera from Nokia 7.1 Oreo you will never have this problem
- in video recording the always refocusing "hunting focus" even to the slightest move
Unfortunately there are almost no tests available on the internet to prove this point. If you search on Google for camera tests of Nokia 8 after May 31st 2018 the only one I have found is:
https://nokiapoweruser.com/nokia-8-pro-camera-ui-demo-issues-tips-to-get-better-imaging-quality/
Nokia wasn't very helpful either. They gave a substantial camera update - a totally new app really - but 'forgot' to give a manual. They even 'forgot' to tell the customers what the new features were ... I only found a very, very short commercial explaining that you could now tweak a few pro settings.
(I hope my manual can be of some use now ...)
What you ask for in your comment are really a number of extra new features that would make the camera app better. You and I can only hope they are still working on the camera app and ask, hope or beg that these features will be added in a next update.
See https://mijnnokia.wordpress.com/2018/10/17/nokia-8-een-schitterende-aankoop /
Flagship quality? What is meant by that? Are you comparing with Galaxy S9 - S10? iPhone XS or XR? I have a phone of 299 euros - one of its rivals at that time was the iPhone 7 Plus which nowadays still costs 659. Perhaps even that phone makes better photos today but I am not willing to pay that much and I am also not jealous. I am just an amateur photographer.
2
Gcam: sorry to give the wrong impression. I am really quite willing to accept one of these ports produces nicer pictures especially as I and everyone else can easily install them at no cost at all. And it will make my Nokia 8 even better! Up till now I have had two different ones and I am not really convinced so far. Which one do you like the most on https://www.celsoazevedo.com?