Looks great

However, I would definitely mess with the lighting in the final scene a little more, (tip, the light is emitted from the brown part at the TOP of the light in the editor, not the light bulb itself)
Also, I would change the colour of the lighting in that screen, and in screen three. I feel those colours just look too much like the stock colours, way to vibrant to be realistic.
There was a tutorial floating around on how to get really awesome looking light coming from that lamp, trouble is it was from about 2009 (I think - not sure)
I'll see if I can dig it up again and post it here if I find it.
Really like the scenery you're creating, looks very interesting and I feel like exploring!
Edit:
Here is the tutorial I was thinking of (I THINK - it isn't on youtube but is a 50mb download) It's by Creator of Zombies, an old guy from the forums some time ago. Quite skilled and talented with lighting and shaders especially

Link; http://forum.thegamecreators.com/?m=forum_view&b=21&t=163911&p=1
Also, this tutorial here might help you, this one is done by Wolf. If you don't know who he is or what he's done, you must live under a rock

http://forum.thegamecreators.com/?m=forum_view&t=186371&b=21
That tutorial specifically pays attention to your lightmap settings, and the colour that your lights are. The first one talks about blending multiple lights together to create a realistic looking effect.
You should try and find the midground to get the best possible lighting. Afterall, for me at least, lighting makes or breaks the game.