From the shots it does apear very clean, the lighting is very clean and there's no decals places in the map suggesting any type of activity at the area what so ever.

Depending on the theme you want to give your map, try adding tyre tracks to the areas where you think vehicles might leave them, decals of maybe adverts of the company who owns the place, maybe some little rascals left a spraypaint tag somewhere on a wall.

What would happen around a warehouse? What type of things are actually stored there, how would the place be lit? Would there be machines and sounds going round the map of production or is it really storage, which would mean there might be stuff like containers thatare half unloaded, yet to be processed further.

Take some time trying to note down all sorts of activities that you would expect there to be would your map be a real life situation, and the nafter that ,try to work out how to incorporate these activities into your map.

This is a nice base of a map, but the lack of detail leaves me to think it's not complete, rather like 90% or so done.
Little additions to the atmosphere can greatly improve immersion into the area and make the player feel like they're walking around a place they would encounter in real life.

Good looking map, my only critique is that its too clean. The cement has no tire marks or dirt on them. This can be acomplished by decals.

From the shots it seems a bit open, just in the sense of bare floors really. Braking it up with more props might help, but also might be too much. I think maybe even decals, trims etc would help break it up a bit more. It might also be the texture, compare the first shot to the last one and you'll note the last looks better (floor-wise).