Tactical maps for Shadowrun

[Brombur]

I built these in Pixlr through google. It was my first serious go at digital map making and I'd love some feedback. I usually work with handdrawn maps and haven't brushed off my desktop publishing skills since college forever ago. I like the overall look but I can see some issues. I built them for tactical use so they are sized at 70 pixels per grid square (70pix = 1 meter') I added a shadow layer then light sources either by brightening the shadow layer or by erasing shadow and adding light on a separate one. Not sure which effect I liked more. I created this by taking textures, like rust, steel, etc and turning them into tiles which I layered and placed. The 4 maps join together, mostly accurately, except for a bit of a hitch between bot left and bot right.