Yeah, making manga on HM is hard. I speak from experience – although I’ve only really tried it seriously a few times. I just don’t think it’s worth the effort trying to use the program for something it’s really not designed for, when I can draw manga just as well by hand.
If I might make a suggestion, the manga girl looks a bit cross-eyed. Maybe you could move the eyes a bit so they’re either looking forward, or at least the same direction? It would definitely help.