Not bad so far

I think it's a good basic concept and there is a lot of energy and dynamic in that water spirit.

So far the style of the background and the water spirit seem to clash. The white lines of the water look almost "vector-like" while the trees look "painting-like".

I would really like to see this finished someday and a different background added.

Unfinished

You said it yourself, but still I like where you're going. I'd fix up her left hand though, because as it is right now, it's pretty hard to tell the general shape of the arm. Oh and perhaps hint the right hand too, or else it looks like this pulchritude had an amputation.
Happy friday flood!

Could use some work.

As you say yourself, its horribly unfinished. The background makes no real sense, things further away should be blurred more, not sharper; Apart from these three trees there really is not background, and I think it might have been better without any background at all. I like how you tried to have some movement, but its inconsistently applied. her face should be a bit lower (or she has a really long chin).
Other than that there is not a lot I can say bout this as it is right now.