Do you have the game? I'd be grateful for any tweaks if you do! I think I had my game settings brightness set a bit low when i took the screenshots. Just after I'd finished uploading them, i reached a green underwater section where I couldn't actually see anything, because the blocks the pipes in the water were making the shadowing too dark overall. Wheareas in the normal game, it's just a bit murky grey.
Basically I'm just trying to make the colours pop out a bit more, the character's skin a bit less washed-out, and the textures a bit sharper, without it becoming too bright or too dark.