Good-lookin' Sherm, man! What PE set did you use? Well done!
A fine first attempt at weathering, too. It may be just a wee bit "brushy," but you do see all kinds of patterns of mud and dust on armored vehicles, so I'd say it's fine, if you like it!
Keep on practicin'!
The only other criticism I can offer concerns the rough seam that is evident on the rear of the turret. A little putty and sandpaper, and you can chase those crazy seams away!
Again, a very nice Sherman! Looking forward to seeing your next project!