EscapeRestart

Seems like there are other artists on this forum so I need some constructive criticism! I'm in the early stages of a painting in sai and I need some advice on where to go from here (warning- a bit of artistic nudity):

http://imgur.com/eJAKK7I

I'm planning on making the scene underwater and adding color to the person/dress but aside from that I'm not sure where to go. Advice?
:)