Hello there ^^ great wall! Miina and Karen look good. The light is perfect and the sunset is awesome! I find it kind of relaxing. The colors are really neat, but I believe you should work a bit more on the mountains, because at some point, they don't look so real (gomen!). Can you see the mountains at the very right side of the wallie? they look too geometric , I don't know. Perhaps some curves will do.
Anyway, besides that little detail, your work is awesome :) keep it up!