Im with everyone on the dog picture. it looks kinda timeless. you really caught the emotion, the 'moment'. only changes I would do would be selective coloring (leave everything B/W except for the eyes).
2nd pic is ok in the angle. its not a DSLR so i wont comment on the color reproduction. but if any changes were to be made, I would clone out the post and slightly blur out the background.
3rd one would also improve a bit with selective coloring (leave everything but the car in B/W).
4th can be categorized as a classic case of patience in photography. the moment was to happen or just happened. without the guy, it would have been perfect. so waiting a few seconds as he got in, or shooting the pic just before he got there would have really captured the 'moment'
