Nice job! Question: is that Trajan's forum in the background? Seems sort of reminiscent of it. A view of his column would definitely be a nice addition.
As far as his traits go, I think we need something that reflects his superb leadership and popularity. He was, after all, given the title of optimus princeps, the "best" emperor. Charismatic / Imperialistic might be an interesting combo. Of course, this might make him TOO powerful, as it would reduce the XP needed for each unit promotion, making those Legions even more dangerous. But then he did expand Rome's borders to their greatest extent, so this wouldn't necessarily be ahistorical. I usually find that the praetorians overrun everybody else in the game anyway...
C.Roland: Do you think you could change his hair a bit? I once had someone tell me that Trajan actually looks a bit like Moe Howard.

(it's true!) BTW, if you plan on making any more Romans, may I suggest someone from the Republican era, such as Scipio or Sulla? That time often seems to have been overlooked.