It could just be the angle, or since it's just a torso..but the boobs look quite big to me.
It doesn't really matter, but if you are just trying for a generic female body type, personally, I'd go smaller.
So have a few cosplays I want to do, but no idea when/if I will get to them.
In the mean time, I started up my website for my props, cosplay, and useful stuff. Please check it out