Nice model, and a good job.
My criticism would be the wheels need a little more geometry as they are a little too simple at the moment and not really selling it to me. The tracks appear wrong to the reference I found and could do with a little more attention to get them more believable, same with the body of the tank, again the references I found have fuel cans attached to the back, the front has a "splash guard" or what ever its called. Add a few little details to make the model a little more realistic it would look better for it.
As for the texture, I would use a stencil font for the "grafitti". simple to do and would look more realistic in my opinion. Add some dirt, you dont have to go nuts but enough to make it look like it has been used. Add some wear on areas that would get high use.
A great reference is the guys that make the plastic kits, Airfix etc I use these all the time. The guys on those forums will often happily snap a few extra reference shots if you ask for stuff you cannot see and if you ask nicely will even supply colour codes and their own reference and decal sheets.
reference here:
http://www.essmc.org.au/ken_noble_m113_apc.html
Its a good model right now,lets make it a banging model !
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