o.k. i'm gonna' be blunt here....
1. it's a nice pose, but your base model...doesn't seem to fit batgirl ( for me)
2. cape. very nice, i love the shadowing and highlights.
3. the mask. has that "most definitely painted on look" some highlights and shadowind around the eye areas and cheek structure would improve.
4. nice background, it looks like you put quite abit of work into that... esp. that lightning.
over all, its a good manip, although I don't agree with the base model. I've seen you crank out some really good stuff... but there's something aboout this one, not meaning to be too harsh here...again quite good...despite what I pointed out already.