Nice Thrallala. Yes ceilings are oft left alone. Will be nice to see the detail you add later. 
I find crystal glow too intense. It looks just like a ball of light attached to its root.
Lens flares. However, I feel like the glowy crystals provide to the mystical/unrealistic atmosphere within the map. I tried removing them but I feel like the map looks better with the flares. However I could tone it down a bit.
That's looking really nice Slainchild. Simple yet effective.
Here's what I've been working on, began importing meshes and lightmaps which is quite boring. Also the lighting looks off so I guess I'm gonna have to tweak the lighting in blender and rebake the whole thing something I'm not particularly looking forward too. But still ambient occlusion and soft shadows are awesome.
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It'd be cool if you could convert that material to UT3 and make a unique looking map that everyone could play! Good job!