The idea is "like id did", but I think there are areas which are similar enough to the game that I may get a bit of negative feedback about (and already).
I've tried to make the lighting as varied as possible to mask the large flat walls. But it probably needs a few more tweaks. 

is superior 

Why not have the swamp bricks just along the waterline, like they've been affected by the water but the ones further up are dry. Could put some decals on the plainer parts of the wall too. Or even cage the torches off to create some cool lighting effects. The roof could have some lighting effects as well. 

Got back to extending the Daikatana menu...
http://i2.minus.com/irXk0cibBM5HB.png

Greebles, too much! 

I always loved the texturework in Daikatana 

Neat work! 

I need some brand new spanking skyboxes for my ITS mod and I downloaded the latest Terragen. Compared to the previous version I used years ago it sure has a lot of new menus and buttons to play with!

First try at a Terragen 3 Skybox, Moonlight Crater 

 

but I might have a tinker with it for fun 

Don't like the new GUI... really confusing to me, reminds me of the new Kismet system for Unreal. 

atmosphere reminds me of Zendar but with Quake purple sky (no wonder OTP liked it!) 

http://i.imgur.com/bPKw5MP.png
http://i.imgur.com/BYufWsH.png 

so far. Keep it up! 

You have a thin stripe of brown bricks on the floor (second shot). Something tells me it wasn't intentional. 

Working on my brush techniques. Bright enough?

http://i.imgur.com/e32Bp2Z.jpg 

but other than that, looks great. maybe some chandeliers or rafters to break up the uniformity of the central vault? 

Pillars in the middle could go a long way too. Anything to create a little bit of parallax goes a long way. 

The shadows cast by the wall torches. It's almost like some sort of fake AO effect.

I wonder if an AO technique could actually enhance the base quake aesthetic. All the big bulky architecture could possibly make it look really nice. It looks fantastic in Minecraft (I think they use some sort of fake AO effect there) and really makes the blocks pop.

I've never seen a Quake engine with AO and I can't force it on in any of the nvidia drivers for Quake engines.

Eh a bit of a tangent :) Nice shot anyway, agree with others re: door. It should be brighter. I think some ceiling detail is needed as well. Perhaps some supports coming down from the ceiling into the room. 

Brushes look good! But the torches, maybe try this

http://necros.fov120.com/post.php?postID=5 

If you map using Radiant you could do a test with Q3bsp + Q3MAP2 inside FTE or DP, which has the 'floodlight' and 'dirty' compiler switches. Essentially a form of AO. It can also do bounced lighting. Otherwise just spamming a ton of large radius low intensity lights in a 3D grid kind of works, though it won't give you the high res crispy-outlines kind of AO. 

I just remembered Slapmap's awesome lighting technique.

http://slapmap.wordpress.com/2013/04/23/outdoor-lighting-and-fake-g-i-in-quake-with-examples/ 

yeah that is bloody good, as as the chap says himself, it's fairly easy to spam a load of lights around like that.

That said, AO done in light.exe would be nice 

http://i.imgur.com/kQavNMu.png
http://i.imgur.com/Q0wP3Vo.png 

On the wiki. 

That looks great, and is basically what I was rambling about :)

Something like that works great outdoors, I wonder how it could be used for indoor stuff as well. Perhaps creating an array of minlights around prominent indoor light sources as well? I would have to test it but it could work.