First one is cute... needs some contrast and brightness adjustments.
I kinda like the third one- not sure if it was intended, but the kid looking off sort of towards mom (?) in the background is kind of neat. And the slight off-angle is interesting. There are some interesting elements there. It's not flooring me, but it's interesting.
The other two are interesting experiments, but don't strike me as necessarily interesting shots. My advice would be to look at what is interesting in those (color, texture, funky focusing/zoom trick) and ask yourself how you can apply those tricks in interesting ways on subjects that lend themselves well to them.
For example, I saw a guy take a shot with that zoom/focus trick looking down on a spiral brick/stone area in front of a building. Really cool.