....aye yo beezy?

The two-tone hard lighting easily receives a 4 on this. The cyan gives good transition to the other 2 colors, and makes it more atmospheric.

Those colors are extremely beautiful, especially with the reflective light on the rock. It makes it look like the water's glowing, and makes the painting look mysterious and also beautiful. I also love the use of monochromatic colors on the siren herself. Personally though, I think her face looks kind of "smooshed" together (for lack of a better word) and her forehead is kind of long, but I think it still works because it makes her look more monster-like. I've never actually played Witcher though, so my apologies if they really do look like that. :P
Overall, I'd say this looks really nice. :>