Hey there! I took the liberty of doing a paint over for you to accompany my critique.
First of all, I removed some of the saturation in the picture, especially on the blues. It's okay to use "flashy" or neon colors, but putting very saturated colors together which are opposites can be hard to look at. Usually you want to have one color which is going to be the most saturated, then the further it gets from this color you chose, the less saturated it should be. (See the example with the color wheel below).
In your painting here, it would be applied like so: Pink/magenta-like colors could be the most saturated, but that means the blues need to become closer to greys.
I also thought that some parts of the anatomy were off. I think that some anatomy studies would be a good thing for you to get at. Knowing approximately how the body is formed and having reference for a painting like this one would be of great help to you.
First off, the breast area is too rounded up. Breasts are naturally more pear shaped. Think of it as a balloon full of water and how it would react to gravity. Another thing that I have noticed is that the body of your character doesn't "flow" properly. It looks a bit stiff. What helps is to draw a line of action (the blue line below) in your sketch phase so that you can have some kind of reference around which you can work. The shoulders area seemed a bit too wide for a woman, so I narrowed this down as well.
For the rest, I think it all depends on you doing studies and gathering the right references. Continue the good work. 
I hope this helped!
