Woah, you really did do a corkboard :D You were right with your review on my work, it does seem more effective with the posters a little more packed together, and with the main ones being bigger. The three big posters are a clear focal point, so well done on the composition!
I love your clean linework, I'm not all that familiar with digital drawing to be honest, but there's definitely a set style in your piece. And I also love the texture of your cork board, being the only part without lineart, it really allows the posters to pop out. The shading on the gold plaque is also really good, you really captured the shine, and the writing actually does look like it's engraved! Oh, and I know it's only a small thing, but nice touch with the curls of the paper, makes everything look less static and flat.
So well done, again my favourite part of this would probably be the composition, everything fits together so nicely! And good luck in the competition ^_^!