Pay attention to PPD's edit!

Specifically note how much more room you can have for detail when you remove internal black outlines. Also don't try to add texture everywhere - it has a flattening effect! Instead focus on defining major volumes with shadows and use highlights sparingly.
Boobs could also use a little lifting
Not at all. They are already quite perky considering the lack of support.
While we're on the topic of breasts, take note they'll be fully exposed when the jacket moves (if you animate it realistically.) Nothing wrong with that, but if it's undesired consider altering the design.