Hi!
I think that you have a good start, but.... OK. You have many pretty substantial "chips" or scars in the paint. That's fine, however, IF you are seeking to depict a heavily-scarred tank with substantial chips scattered around, you NEED to make sure that most or all exposed edges (boxes, hull and fender edges, fitting and cover edges, etc.) are pretty consistently chipped or worn away to primer or metal to go along with the big chips. Right now, it looks more like a guy to a hammer and sporadically banged around on things - the chipping does not "hang together" as a generally worn and tired tank look.
A good way to add on the continuity of worn edge paint is to do some dry-brushing over most or all those edges. I think doing so will greatly help what I think you are seeking to show! But keep it LIGHT!
Just a suggestion!
Cheers! Bob
PS: There is one of these things at Bovington's tank museum, I think... And there are some good pics of it on the internet. Take a look and see how the overall wear and chipping appear and use that as your guide.
I have this kit - and I'm going to use that Bovington specimen as my painting guide!