To be honest:
I love colours, dark and/or light .... but I prefer the more colourful ones. Skyrim is a little bit too grey, but thanks to some funny roleplay features I like to play one time this game further on.
Kingdoms of Amalur Reckning is very cartoon style and very colourful and I like it to play such a game because the dungeons are colourful, but with more dark colours, it's nnice done immo ! So I not sell away this rpg.
DD is in fact more dark than light, but DD is really so big fun to play that to dark or to light graphics do NOT irritate me 1 second !!
DKS hase more light colours than DD and I love to play DKS !!
Risen, Dark Souls and more : I don't like the more realistic and darker graphics, but that's me
I like detailed objects like in DD with small or bigger objects like an orange, apple, chicken meat, fork, knife, a chair, barrels, chests, rocks, etc etc ... but DD is still a fantasy RPG !! I've the feeling Divnity Original Sin is going that way, but even with more technical advantage because, of course, it's currently 10 years after the release of DD !
For me the most important things with the colours of a game are that they're not too dark or too bright so it do not start after a very short time as
"a painful-play-for-my-eyes!!"
It can be a nice idea to give the player the option to set the atmosphere more dark or more light.
Aside from this feature Gothic: Arcania give us it's a too casual rpg immo and not worth to spend my gaming time on such a rpg, so I sell it recently away, together with other games !
