Very nice!
If it were mine.....I might eliminate the large white background "hole"....turn it dark and solid, for me, it is one to many focal points that does nothing, it distracts from the moon, my favorite part (also the bird and the woman's face
) I would probably reverse the curve in the rib cage area....making her body more traditionally beautiful and sexy, less weird looking. That is just me though.
How about copying it, enlarging, and playing around with some pale watercolor or transparent acrylic washes....just for fun....
Great job!