It is a nice first attempt. I just would give you a few suggestions.
a) the boob in the back looks bigger than the boob in the front. It is a typical problem for anyone of us. You gotta pay more attetion when enlarging the boobs.
b) the shape looks unnatural. Try to cut the unwanted part.
But, as I told you, it is a nice first attempt. Now it is only a matter of practice, like it was for everyone of us.
Feel free to contact me, also by pm, if you need more suggestions.
Blax12