Very good for a beginner. I see you used acrylic paint(?) to paint this. Continue to strive to get better in your art and you'll go far. I do the same and I've been drawing all my life, only recently in the last 6 years or so my art has gotten better so your on a great path. keep it up! and good luck in the contest!
Edit: Happy that I could help. I haven't painted with acrylic much. I just got into painting myself and have been doing outside murals. One of the murals that I see I posted on my page and that was on the side of a garage so its big. and its my 1st mural lol I'm drawing everyday too. Can't seem to stop, if its not a doodle then its a coloring page for another one my self-published therapeutic coloring books or just a drawing for simple enjoyment. I look forward to seeing your art get better and better:) And thank you. I just read your comment on my illustration.