Hm, not so sure about those Carrot Top thighs; I'm all for sexy, but they seem a bit distracting. They kind of stick out with how they contrast in color to the rest of her outfit. Other than that, I love this! A really brilliant idea, and wonderfully drawn. ^_^
There's nothing more I can criticise on this. Your best work by far.
Well, maybe except Carrot Top's amazing abs. Not impossible, but a bit improbable. And Batgirl was never known for being particularly ripped in the abs section. And if she had those abs AND those breasts, most girls would probably glare her down to bits in sheer jealousy. xD