Kieran,
As others have said before, it doesn't look knocked out. Dirty, yes, but not knocked out. There should be at least an entry hole somewhere that killed it. Also, lifting the turret slightly out of the turret ring may help to give the inference of an internal explosion (although in actuality these tanks tend to go up like a Roman candle). To show fire damage, you may want to sand the "rubber" portions off the roadhweels and then got to town showing burn marks on the paint. In addition, there seems to be no rust marks on the sheet metal. These parts will show rust far faster than the heavy ballistic steel of the main armor plate. I hope that helps.
Regards,
Georg