Let me say this again: AA shouldn't be longer than half the width of the line you're trying to antialias. Her legs are full of AA that violates this rule.
My advice would be to leave this as is, and try to remake her at 1/2 and at 1/4 size.
After the 1/4 size (where you'll be forced to work without AA), you can go back to this big sprite and see what you've learnt. I predict it will be a lot.
Do this as an exercise. Otherwise this will be a forgettable piece. My sense is, and correct me if I'm wrong, you're not learning anything new from this right now. Go smaller and revisit this. If I'm wrong and I wasted your time, come back and tell me
good luck