the texture
in these pretty realistic drawings you're pulling off you nail it all VERY WELL. it's just that the colored pencil texture that resides makes it look less real. I guess that's the sacrafice made. anyways beautiful job, the pattern is great, and i like how the focus is on the details up close rather than EVERYTHING in the image (the amp).
only thing that stands out to me is that the whole picture plane is off. it could have been the way you made it digital, but the grain in the floor and the amp are both at a slant. if you did that on purpose, its fine but it seems like it was a mistake when it's that minor of a slant.
otherwise i know you put a great detail into the pattern and reflections, so good work. good luck getting it back from the AP judges, i'm sure you'll be fine (let's hope the drawing is in good condition as well)