You need to work on smudging technique. Simply smudging a focal back as you did doesnt look that great. You should keep the stock mainly intact, with only really the edges smudged. As before, you need to work on your text. The BG conflicts with the flow of the smudging. The BG and the confetti have no relation colorwise to the focal.
Too much smudging dude, but for a tank I don't think I'd just leave it on a bland BG, maybe on an actual terrain