In the painting there's a delicate interrelation between colours - you have browns/greens/blues in the dark parts, and more whites/yellows/blues/pinks in the light parts. I wouldn't describe it as bland, though it is in a sense washed-out. BotW doesn't, and probably can't have that level of handling of shades colour in the enviroment graphics if nothign else because of the technical constraints of the Switch hardware.
Looking at the screenshot, what can you say - you can say that it's nice that the green/yellow of the sky is mirrored in the green landcape with yellow rivers. And the back-lighting of the sun is helping give definition to some of the mountains/hills, which is nice. But I don't see very much subtle going on with the landscape.
Looking at the art, you can see a lot more dynamic range, clearer silhouetting of mountain ranges at various distances, whereas the actual game is more monotone-green. You can also see the fog doing a lot more work of making the shape of the land clear. There are some bits of fog/mist in the screenshot as well, but they're not doing as much heavy lifting in terms of giving shape to the landscape.
The Switch is really limited on the hardware front, and I can't imagine what kind of trade-offs the art team had to make to get to where they are - it's a very difficult balancing act that I only understand a small part of. Nintendo also tend to be very conservative/restrained in their 3d style (I remember being somewhat unnerved by Ubisoft's "Mario + Rabbids Kingdom Battle" Mario game, because it went super high-production-quality).
It feels a bit cheap to give as an example, but the 3D MMO Love by eskil steenberg tried to emulate the impressionist style, and did a striking job:
https://imgur.com/9U18eRZ
The bloom effect is doing a lot of heavy lifting to make the bright colours pop, but even in the less glowy areas there is quite subtle layering of colours going on and one does have the feeling that the colours are playing with eachother.
( https://www.youtube.com/watch?v=Cc02ijaw-Tg a video of it in action, if you are curious ).
As another comparison, looking at elden ring you can see they've gotten 'using fog to make landscape silhouettes pop' down to a fine-art (maybe they're even over-reliant on it)
https://imgur.com/a/5GEePwL
And looking at the landscape you have really nice looking brown/oranges in the fields in the foreground, black/greys/browns in the mid-ground, rocky cliffs, fog is actually glowing, and you have some green forests in the top-left. That's a lot of nuance for what's essentially a brown landscape. BoTW doesn't have that - would it have it if the team had the hardware capabilities and time and budget? Who knows...
