Honestly, I really like the three of them. I might increase the exposure a bit on the first, maybe lift the shadows a little bit, but it's quite good.
The second at first I thought was just a snapshot, but on a second look I noticed the ball heading towards the pin, and like the capture of the girl's body language as the ball travels. I like it as is. Potential suggestions would actually be to have slightly decreased the aperture so that the traveling ball were less blurred, but given this seems a spur of the moment thing, I also think its fine.
I really like the 3rd as well. The only thing that would've made it more perfect imo would have been if you could have somehow gotten the branch out of the frame or somewhere a bit different. It distracts me a little due to it's proximity to the antenna, so it kinda feels like a part of the car. So maybe lowering the antenna would have been better.
These are quite minor complaints though; you are off to a great start. Also, looking through your Flickr photostream, I really love your abstract stuff.