On the first picture her one boob looks waaaaaaay bigger then the other, also if you want to have them that big fine, but please don't make her look like Barbie.

The second picture is good but her arms look way to skinny for her chest to have huge boobs, also, once again, she is coming off Barbie-ish. I think you need to thicken her out a bit in other places and lay off the boob.