Toy Truck

Medium: Black and White Prisma colored pencils
Paper: 40% Warm gray Cason paper
Dimensions: Truck is 8' tall
Time: 6 weeks
Class: Intermediate drawing
Objective: Render the toy truck as realistically as possible

Problems I already know about:
The treads on the tires are not at all going to the vanishing points, nor are they evenly spaced or sized
There should be more contrast between the light and dark values (some areas need to be white white and other black black, right now they are just gray)

Helpful Critiques welcome and appreciated

_{This picture was taken by my phone so it's obviously not the best picture of the piece.}

Once more I wish I had more time (even though I know I had a LOT for this piece. I'm just not at all happy with the treads on the tires and wish I had gotten the perspective more accurate.

If your interested in a print of this please let me know
_{The picture is being graded now so I wont be able to print copies until I receive the picture back}