do you play the violin? I love this instrument and I love your work too <3 Interesting the fact that you used brown paper, I like brown paper :D
for printing it, i suggest you take a photo of it: you put it on a black background, such a black paper or a piece of fabric. Then it can be on the floor or on a table. Your light source should be in front of the drawing, so the drawing is between you and the light. You can for example put it next to a window. Then take the photograph with a good camera and the highest resolution you can. So when you print it (on photo paper is better) you will have a good quality image. Good luck in the contest!