I love the mood and lighting in this, Markus! 
The depth and the FG colors are great! I also like the boulders and the slope of the middle ground area. The lake in the distance really adds a lot of interest for me and the clouds are amazing, especially since they shroud the distant mountain peak they way they do! 
Personally, I would consider cropping the bottom, maybe take this to a 4:3 ratio (I mention the ratio only as a means of conveying how much to crop off the bottom). I just feel that the area with no flowers and being dark is slightly negative, it creates a void but this is subjective, meaning it’s just my personal opinion.
I see some banding in the sky and around the bright area at the URC, I’m using a 2K ASUS ProArt monitor so I don’t feel that it’s an issue with my monitor. I did notice that this is almost 4000x5900 pixels, yet the file size is only 873 KB, I’m guessing that NPN resampled the file size and compressed it some. To avoid NPN compressing the file size, try uploading at less than 3 MB, preferably around 2MB or close to it and maybe resize the image to around 2500 pixels wide for a vertical image.
4000 pixels wide is great for pixel peeping though 
Also, I noticed that the flowers and boulders are slightly soft and that may also be from the added compression.
I downloaded your image and ran it through Topaz for noise reduction and it seemed to clear up that banding issue, there was still just a touch of banding around the bright URC area so I bumped the exposure up a tiny bit so solve that part.
Of course I feel that uploading at a lower file size might clear up the banding and maybe I’m the only one that sees banding to begin with? 
My point with the example edit is to demonstrate that noise reduction can be used to clear up banding issues in cases where jpeg compression isn’t the cause.
I reduced the image size by 50% but I can’t see the file size until after I upload the image.
Edit: After it uploaded to NPN, it appears to be 2.27 MB, it was saved from Ps at 2.32 MB so NPN’s compression was very minor.
I suggest having a look at the file size of your saved image and compare it to the file size of the uploaded image.
Anyway, I hope this helps and again, love it, I wish I could have witnessed this scene in person!! 