My one piece of advice, is to use something else instead of that tremor floor texture. The texture is ugly.
Apart from that, you really show alot of promise, the small bits of detail on the walls or stairs or ...etc
Also, your theme is a space lab, make it more space labby. The human base looks great, and looks like a lab, the rest of the map looks like a generic tremulous space station map.
just a couple of ideas to achieve this:
- In the hummy base, those forcefield things, instead of space being on the other side, have a small lab like room (white textures, maybe a bit of blood)
- The hallway in the screen could have a couple of doors or forcefield labs running off of it (accessible or non)