Getting something done

[Chiritsu]

Not entirely sure what the story is for your picture but here's a quick paintover none the less.
I hope you can understand my notes and these are only my 2 cents on the whole thing.
So a quick break down is...

I think you may want to do some female anatomy studies so you can get a hang of how to draw the female form. There are some parts in the drawing where it feels like their limbs are broken or out of place.

Material studies might be a good idea just so you can re-define your background that you're thinking of having and that way when it comes to drawing/painting different kinds of surfaces (scales, coral, jelly fish etc)

Also variations in your composition. Currently it feels like that you're only drawing in the space you've given yourself which seems super restrictive (makes sense in a sketchbook since all the page sizes are the same..). The good thing we have with digital is that we can make a really big canvas quickly, draw what we want, then crop it to our preferred size without waste of resources :D

The perspectives in the drawing also feel strange. I understand that you want to make the picture nice and dynamic. Just be careful with this kind of thing as it is easy to make a picture feel off set..

Last of all, think about the characters silhouettes. What makes it so you can read that it's that certain character right away etc.

Roughly blocking out what you want might illustrate what you want in an image first will save time in the long run. Rendering too quickly means you're committing to the lines you may have only roughly placed in the first place.

I'm also definitely interested to see where you go with this piece with your rendering style atm. Hope this helps :p