I've already answered this in your other thread. And really, size is determined only by how long you want to spend growing boobs and your willingness to abandon functionality, because eventually, you might need to start taking doses that will cause sterility in order to keep growing.
As for breast shape. At first it MIGHT be moobish, but over time, with continued dosing, real breast tissue will develop, and real breast tissue will of course look feminine.
Though as a cross dresser... I should ask you if you are doing this because you honestly want to grow a pair of breasts, or if you just want them to "enhance the look"?
If you just want to enhance the look... There are products out there such as silicone body suits and breast forms that can do pretty much anything you can imagine instantly, and when it's time to be male again, you just take them off.
If you grow actual real feminine breasts, this is a permanent part of your body from then on and will force you to make changes to your lifestyle you may not necessarily want.
Me, I'm a transsexual, I welcome the life changes and in fact want them to come faster if at all possible. But I doubt that most male crossdressers would be as interested. In fact my younger brother is a fetishistic crossdresser but otherwise perfectly heterosexual and wants absolutely nothing to do with boobs.