3 things about you map, aside from the fact that I think its amazing.
1) Dont do the func_dsm thing with the basement, just leave the basement there, its another route and there was alot of time spent there as I could tell.
2) Please make your torches burn orange instead of white. It adds realism and a good lighting contrast to the already white light of the sky.
3) I suggest changing the grass texture, because I do not think it compliments your map, or just seems out of place. Try one of the CTP1 texture for your grass, perhaps grass_g_5. Your call on the grass though, its not a priority.
And just as a side note, a second flag as Clipz said would be great.
-Cusoman