instead of crates, u can use blocks of ice or other shapes, cut out from the floor perhaps or have a giant crack in the icefloor with the ocean beneath. Some rocks as well, i dont see any rock so looks more like concrete is underneath it all. Some wheeltracks on the snow, some green camo or yellow arctic army tents would fit in too i think and sum snow sticking on the walls and hanging from roofs.... and inside.... molten rivers of icewater with lucious blingbling crystals growing on the walls. That tree doesnt look very arctic btw
Oh and i think what bothers me about the stuff in ur skybox is that almost all maps ive seen use that cylinder thing. Industrial maps,city 17 maps, even inferno which is supposed to be a meditarenean town is surrounded by that thing:(
It doesnt really make ur map stand out or look arctic