Normally I'd agree with Runnah and Charlie, but in this particular case your original image is working better for me. I have to figure out why (because it looks like an exception to the rule), but it may have something to do with the expression on her face and the personality that's coming across. There is sadness and resignation in her eyes, and she appears (to me anyway) as a rebel/nonconformist of sorts. Given that, looking at the end of the frame works better because it's almost like: I don't care what happens here.
In general, I really see potential with her. Your model appears to be a very interesting subject with a strong personality. May be you could bring that out more? E.g., in her clothing...instead of black leather, may be ask her to put on something more indicative of her personality. Tattoos? I obviously don't know her, but I'm just expressing what I'm feeling. IMO good portraits always reveal the personality.