Joseph,
from what I can see it looks like you have done a very good job with a clean build and some subtle weathering on the vehicle body. You have done well with your post shading work! Great vehicle to model.
The tracks look like they could use more weathering, though. Also I noticed in the 4th pic that one of the right hand side roadwheels is extending out over the track.
The pictures are really dark. It helps if you have some direct lighting (no flash) that you can use to illuminate the model. I use a small spotlight in my pics.