The idea for the composition is pretty good, now all you need to do is polish it up. The grass and lines on the side of the composition can be neatened up, as they seem like slight scribbles at the moment - as if it was incomplete. I think a good reference you could use to implement in this could be some illustrations by Edward Gorey.
The boy in the background looks kind of iffy, like he's leaning too far to the right. He also seems a bit flat, so I'd suggest revising that part of the piece. I'd also play around with the use of colour in the background, as it can give off different vibes. You could play around with some cooler colours to express a cold vibe to the piece.
It's overall on the right direction though. Good luck with the competition.