The thing that caught my attention to this drawing was your choice of subjects and the skill you show! The amount of details is great for a cartoon-ish girl. Coming from a detail freak, I'd do more details to contribute realism for those 5 stars. I would also maybe add a little more contrast (or is it the camera) and use black liners for more impact. As for originality, you've made an unusual subject combination, but you haven't made up anything new (e.g. a character, which would prompt me to give you 5 stars). All in all, this is a pretty drawing with a great composition and a somewhat dark message!