Nice! Engaging eyes and an irresistible, almost concealed smile. Good lighting, colors and sharp focus on her - but not too blurry bg, so that you can also read the wall writings, which kind of relates with the t-shirt. Very good composition overall.
The lighting is good. I almost wish for either a more shallow or more deep depht of field, to either create a complete urban look, or just a very colorful background. The cropping is a bit off to me though. Wish you would've included her arms.
ROFL that is hilarious!! I'm sure not everyone will get the tee shirt's reference, but it's really funny. I'm trying to read the graffiti behind her. Face off?