It is nice
Your background is absolutely stunning minus the images of a girls back pointing towards our view, everything is else is cool the water is fine as well,
the other reviewers already pointed out there is something wrong with the proportion of the body mainly going down from the waist, the sense of depth is a little odd somewhere but I cant pinpoint it.
Your coloring is beautiful, better results if you tried to match the skin tone of your characters and the position of your light source, all the best