Very nice job so far, good work.
1) I never liked the casbah layout anyway
2) If you pick up the red flag, the objective icon will lead you into red spawn. This is a serious problem for new players. If it's possible to fix it by flipping an area that would be great. Blue flag doesn't have this problem.
3) 3D skybox would make the open areas look lots better. A few minarets or domes to add some vertical variation. Anywhere there is a long flat top to the map should be broken up.
4) The flagrooms are a bit dull, and don't really fit visually with the rest of the map. I'd redo them completely and make them a bit grander. Should be something special about them that makes them worthy to hold the flag, like a palace garden or temple or something. It's a small enclosed area so you can go nuts with the detail.
5) Few more features and details to break up some of the long flat walls. The big open areas have a single floor texture, break it up with a path going through or a paved central area.