As a female as well, I don't see anything wrong with showing parts of the female body. Nipples don't always need to be something that is sexual in nature - they're just part of the female body - I mean, anything can be sexual: the hourglass curves, a tight butt, etc. It's all a matter of perspective, I guess; I've ordered this piece to put on display and I can't say that it's an issue that bothers me in the slightest. In another light, to shun the female body is just as bad.
That said, we're also talking about a comic book character. ALL female characters in comics tend to be over exaggerated: Power girl, Catwoman, She-Hulk, Spider Woman, Ms. Marvel, Poison Ivy, etc. It doesn't make them any less awesome; most of them use their 'sexuality' to their advantage. It doesn't make them any less amazing then male superheroes.