Not bad. I agree about the roads - a different texture, but which one I can't say. You could possibly make some of them a bit narrower, too (try to imagine what it would be like standing on those main roads - adding a scale might help with this).
I also like that curved road leading to the royal quarter in the lower left. You could try turning it into a real feature - a curving avenue for triumphant generals to march down, or where diplomats are shown the splendour of the city. Something like that, anyway.
I don't know how other members of the CG feel about it, but you might also want to transfer your maps to a WIP thread in a separate forum. It'll probably help you to get more feedback, too.