Her body looks too small and not proportional to the rest of it. Lovely concept and coloring.

suggestions:
1) underwater feel, should include glistening to the mermaid
2) make hair more "lighter" (now looks heavy, too thick) and free flowing
3) the dangling sea-plants should have different shades of green to create depth
4) trailing bubbles around arms and tail, to create sense of movement
5) lift up the abdomen of the mermaid to make her more shapely
6) add some fish near her, both infront and behind her

hope these suggestions are useful

thank you both for the great feedback... I took note of what you said and made changes.

I hope you like them

Congrats!!

Congrats

ooh.... its perfect now, go frame it up and CONGRATS!