Good work!
What color did you use for the base coat? It looks perfect for allied armor (particularly Shermans).
One point from the Critic's Corner: the weathering is a little too "brushy." That is, the mud and dirt was applied in such a way as to betray the fact that it was indeed applied with a brush. Also, the location of the mud seems a little unnatural. I would suggest studying reference pics of muddy armored vehicles, and even modern construction equipment to get a good idea of where and how mud, dust and dirt accumulate on vehicles.
To avoid "brushiness," you might want to try not loading as much "mud" paint on the brush, and apply it lighter strokes.
I hope you find my suggestions helpful!
Again, good work.