I agree wholeheartedly with the team-colored ground bit he said. It's WAY too red, and, outside of a base, will confuse players as to which part of the map they're on. The top half of the screenshot has that red ground clashing with the blu-colored concrete, and that's a SERIOUS no-no.
You have to approach TF2 like the playerbase is about 4 years old. Signs everywhere, objectives highlighted with that rim lighting, and team colors ONLY in areas that are under that team's control at the beginning of the map. Not that funky velvet cake stuff you got going on there.
Speaking of which, that texture needs some work. It's not orange enough; nowhere do you see terrain that's that exact color. I don't know what you were going for, I'm assuming something like this:
Take a look at that, then at your texture. A hue-shift of what looks to be the stock dirt texture isn't going to be enough. Even if you don't have any texture painting skills, take out your eyedropper tool and look at what color that dirt is compared to what you have in your texture. Your texture is WAAAY too red. It needs some orange in it somewhere.
E: Also, I've found this thread works best for immediate feedback on stuff. I've had several times as much feedback from images posted in this thread than images posted in my map threads. People look at this thread often, it's typically the thread that's been posted in most recently. To put it bluntly, people don't care about map threads until it's in beta, and even then they only care after they've playtested it a number of times (Gothic, Zinkenite, etc.).
