Am I really that guy who won't hold back?? I promise I'm not any more forgiving (probably much less) on tearing apart my own work!
Well, most of it has already been said. The lighting on the first one just is very harsh, and has out of control highlights all over. The most egregious of these is the image right side of the car, that is just way to bright and specular, and draws a lot of attention away from the girl. Other annoying highlights, the shadow line on her cleavage from the hard main light, and the random hot spots on her right arm. The lighting her face is quite rude, and also, I think her face is underexposed quite a bit, which really works against her with the right side car being so hot and the background being so busy. Aside fromthe fact that our brains are always trying to sek out faces to look at, there is nothing else in this photo that draws me to her face, or any part of her. When I look at this, I see the giant hot spot first, and then eventually make my way to her face, which should be the first thing I see. As a whole, I think ther whole graffiti thing is just too much, graffiti on the car and on the background is just overwhelming. Maybe one or the other would have worked, but I don't think both.
Second photo, I think this one is better for sure. I think her face looks much better with this kind of expression, versus an all out smile. She's got one of those over-enthusiastic, face-widening smiles, and she already has a bit of an NHL jawline. So I think think the subtle smile is better looking on her, and for these types of shots, I think it is a little more fitting as well. Lighting looks much better as well, but it looks like you key was a lot warmer than the ambient, and I don't really like that her legs seem to fade cooler and cooler towards her feet. I also have to agree with the first guy, that it sort of really looks like she is going to the bathroom, which I hope wasn't your intent. And even if it doesn't look that way, with the bucket, I would have spun it around so all the writing wasn't so apparent.
Again, not a huge fan of the graffiti, in either. It seems to be a pretty popular choice for this style of photography, but I think I see way more examples of it not working and just being too busy, than examples where it works and looks good.
Good work though, keep at it!