size of the boob is fine I think, its just that the top is only covering the top half of her boob which is wierd.  You can just lower the top 1 pixel, its too high anyways

how do you mean? Should I have done the bikini in less pixels?

Underboob is too large! D^:

ah in the end I made it 200% because it looked better bigger but I think you are right the arm behind is kinda weird, cheers:)

Your outlines are 2 pixels wide, I think it would look better if this was reduced especially on the woman as the hidden arm bit looks a bit confusing.