Hi Frank, I quite like it. I think the juxtaposition of the curves in the bike and Kiki is interesting :-) The photograph does well portray her mood, even without the description, which makes it a good portait for me!
Few things that could be improved though: tonality - some dodging of the face, and the overall contrast is too high I think the curves - I would like if there was more of the picture to the right, it's a bit tight. bottom - maybe (I don't know if possible or not!) it would be nicer if the bottom of photo was cleaner - if you had perhaps been a bit higher (though that might have changed the perspecitve too much for the juxtaposition to work - I don't know). Overall, improve the tonality, IMNSHO, and it (is already) will be a great portrait! Good light! fra