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In my view you should work a bit more on the weathering (filter, wash, and drybrush), because the overall vehichle looks to me a bit too flat..
I have seen this problem a lot recently, trying to achieve a subtle weathering or variation on colour and it doesnt show up in the pictures as the lights bleach it a little. The thing is Russian armor looks more realistic with slighly over the top weathering and this would be a good model to take it that little step further ..... if thats what you want or like???
Dont worry about too much dust on the road wheels ... this would be normal in dry weather as the roads were turned to mud in the winter time! Overall the model looks great, but I have to agree with Scoccia, a burnt umber wash and alight dry brush would bring out the detail a bit more, without getting the heavy weathered look.
For simple paint chips a good method is to open up a ball of steel wool or a brillo pad with the soap removed. Then mix a nice rusty colour .... I use humbrol gun metal (53?) and German camouflage red-brown (160?) mixed 50/50. Dip the opened up steel wool in the paint lightly or add with a brush, then press into some tissue to remove most of the paint. then touch up different areas of the tank. This gives a very nice effect ... small scratches and no repeated effect. To practise this first would be an idea. Spray some scrap sprue with your same base colour and practise on that. Use a smaller ball of wool to get more control. Works great with a little experience of using it!
Another thing that could do with a little touch up is the spare tracks. One colour rust is a little unrealistic. Dab with different colours of brown and even orange. I use pastels for this and works a dream. Hopefully this gives you some options or help!