How cool that you are following a photography class.
I like the idea of the single leaf and the angle of the first three shots of the leaf make it an interesting shot. This way you see some more of the street. Only on photo number two and three the leaf is slightly blurry (which is a sin in photography 😉).

So the first shot is the best in my opinion.
Keep on shooting! That's the best way to learn and get better.