yea, looks really good!
i would add a few muddy treads and some dirty snow in it if you are going to place in an enviroment. just my 2 pesos. but other than that good job!!!
i'd also check out
www.cgtalk.com
a lot of professionals are on that sire (ussually over 150 people are present on forums at any given time) you might get some more opinions about this piece if you were to post it there as well!