[WIP] cp_caldera

You shold put at least on overview, the screenshots aren't very clear to see the map design.

for future reference: it's generally easier to build the map 1st and then detail it bit by bit afterwards. this lets you focus on gameplay/layout/balance and detailing seperately.
it also means that when building the map and working on the balance, the compile teams remain as short as possible.

regarding your pics:
the rocks in the 1st pic are very shiny... almost makes them look like fake rocks. similarly, they appear to be growing out of the the structural supports, rather than being supported by them.
in the 4th pic the rocks actually look more like overfilled binbags. again they look like they are growing out of the artifical structure around them, rather than being supported by it.

in the 2ndlast pic, there's a gap between the 2 walls, on the left of the sat-dish.
it also looks very dark, i can only barely make out what the darker walls are textured with.

for a fairly forested map, there's a distinct lack of trees.

overall, i suppose the spawn room(s) itself look fine, but i have no idea of the layout of the spawn room, as you haven't taken any screens where you're standing in one corner of the room, and looking out across to the far corner, nor have you given any overhead shots.

finally: the sun/ambient colours seem a little iffy to me, unless you're trying for a sunset type time, i'd say you've put too much red into it. although red can make the map feel warm and comfortable to look at, if you overdo it you got more of a "lackluster" effect - i.e. it feels like the photons/light itself is low on energy, and has a draining effect on a person's attentiveness/interest. this is accentuated in this particular case, as the alpine theme is more vibrant than the dustbowl/desert/other themes that valve have produced.
when i look at the final pic, i don't see vibrant/alive, i see tired and old instead.
so make the sunlight a tad whiter, and perhaps even a lil brighter too.

Yay, attack/defend Control Points.

It looks very nice, although that rockwall in the first image looks like frozen poop. Or, to say it in a nicer way, it looks very shiny and bumpy. You might want to use something a bit more flat- and simple-looking, like Valve's rockwalls.

I agree, the rocks look very odd. Plus all the metal tex around them is the vent texture, looks a little weird used as is but more importantly it's a VERY specular material, that whole room is gonna be VERY shiny, I don't know if you want that.

Then there is the wood window trim around the spytech computer room. You should use metal there.

The dam face looks pretty cool. Overall I think the biggext thing is lack of details. You said you need some decals and a few more props. I'd say you need decals and ALOT more props. (vents, wires, pipes) there are tons to use.
DL the ABS_props library (there's a sticky at top of mapping discussion thread). You gotta have it, open it up and you can see all the props for TF2 and just copy/paste them into your map. It's preobably saved me hours on one arena map so far not having to search for 'chimney, stairs, door....'.
Boojum did us all a great favor with that one.

overall i'd say it's improved. one thing that strikes me is that the top of the dam/curvedwall(is it a dam?) should have some kind of lip/parapet (i.e. an 8 unit tall different coloured ridge on top of it that sticks out about 2-4 units from the wall itself)