Not bad.
I think you could've gone further with the values though. Implied line? It works if done right, but I dont think it's a requirement in art today. Have you seen some of the shit people produce?
Anywho, I think for five hours work, this looks pretty damn good because you've got value structures, and what looks like a nearly finished work. What media did you use, what size is the work, and why was the addition of red required? I hate when teachers do that. "use black, white and ONE color".. Hopefully tints, tones and shades of red were allowed (which, judging by the round spherical object in the corner, I'm thinking they were - which is good).
Looks pretty good, I'd just like to see a more high rez image.