Nice job wes
color - too evenly red all over. try gradiating the color to 2 different hues of red. Maybe more saturation toward the bottom, and less at the top, or gradiate to a more slightly orangeness at the top from sun damage (these changes in value should be very subtle, but will make it way less flat looking) you can also do this effect around edges an stuff to make the forms pop out more.
grunge - at the bottom I see white grugne, (assuming it's snow). It should be darker. Snow only looks white for about the first 6 hours, but after a little bit of sunshine and some traffic nearby, the snow starts getting all black and shitty looking, soaking up dirt.
also, a cool touch would be something like this:
you may not want to go crazy on this prop with detail. it looks real good as it is, but these things could help sell it more, give it more character, and you'll learn something new by testing these ideas too ;P