Fun model, some things that you could do is to add a streaky 'dirty' version of the textures to make it look less brand new. You can add some paint chipping, fading, and wear on the leading edges (expecially if the craft can enter the atmosphere as the wings imply.) Since the rocket exhaust has a good amount of flame to it, think about adding scorch and soot marks to the parts near the engine exhaust.
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TAZ
Also, look at conventional fighters and attack bombers and you'll find all kinds of details. Insignia, tail numbers, do not step/do not paint warnings, kill markers, and the occassional shark's teeth.
When you feel like absolutely no one is watching you, that's probably a ninja. - Ask A Ninja