It looks like you made quite some progress. To bad we didn't see day 1-9...
I had a look at that youtube video on your site. It looks a bit open, dno if you're still changing things to the geometry, but maybe you could add a bit more props for cover.
About the lighting. imo, the skylight is ruining everything. There are so many maps where the skylight is abused.
Try to lower the brightness (to 0.08 - 0.1, something like that), and then place lights where you have a light source. If you want a bright map then you can add a directional light and fake the sun. (This is where the skylight can come in handy to lighten up the shadow parts). The idea is to create enough contrast, (ie good balance between shadow and light). It could be a personal thing though...
Jeroen