the few tips i can give(and please dont take it the wrong way" are. butts (and cleavage ) dont fold like that in most fabrics. its ok to have some, but try to keep it less "deep".
the shading needs work, my advice would be to focus on doing lighter coloring, start with just flatter shading, maybe even no shading. however, i really liked the tone of the sea.
im no artist, so take my criticism with a grain of salt.