Great brushworking, although I don't like the Egyptian theme in TF2.
But you should try to create 2 bases, a BLU one and a RED one, with team-couloured walls, some signs, etc. That's why I don't like the Egyptian theme, there's no difference between the two teams.
You should also add some arrows to help the players getting to the point.
Excellent work anyway.
PS: You should put some thumbnails, everyone hasn't got a big screen (I do have one ).