Ohh, I really like the background, the rail tracks are very pretty and those stones, too. I think his hair could be less messy and more detailed (or organized looking) but this looks really nice for your first try painting. The only thing that looks a bit weird to me is his pose - it looks like he's going to topple over any minute, lol. I'd make him straighter.
Other than that, nice job and good luck in the competition. I just may finish mine on time, haha. :D