I've made that mistake, too....that's how I knew to look for it! Indeed, on my 1/48th sherman I posted a few days ago, I didn't even bother since I was doing it strictly as an out of the box build (plus, I have no aftermarket 1/48th stuff at all). All I added was an antenna.
Speaking of which, your tank could use its antennae as well.
Really, though, it's very well painted/weathered, and you should be proud of your efforts.
Rob