Its definitely spot on - the skin tone, the makeup, the choice of clothing, the shoes, the socks, the environment, the sheer minimalism, its as close to the original Harley Quinn from the Arkham Asylum series as they get.
Well done - You've shown a significant improvement in this work. My personal favorite part of this deviation is... funnily enough, the gaze; THAT, is the quintessential Harley Quinn stare... its blank, its without any blemishes, its crisp... and its deadly, something which she could pull of brilliantly.
And you've captured that part well... It shows - people don't look at what you wear if you don't laugh or smile... make them wonder what you're thinking... eh?