Nicely done! The shading and lighting is great and the expressions tell a whole story of their own, from Wallace's eager eyes to Gromit feeling it's way past time to go back home. The amount of detail is also well done, from the little pebbles around the campfire to the flames themselves.
That said, I find that the fingers tend to fade into one another, especially for Gromit. Maybe the same thing that was done to the toes could be applied to Gromit's left hand. I say that because I find that everywhere else, the shading reveals many intricate details. Maybe it's just a resolution thing.
Otherwise, I think this is a great piece.
Now only two questions remain:
One: What type of cheese is that whose grilled variety gets Wallace so excited?
and two: What program was this made in?