I see what you mean about the guy against the wall; actually, that leg still doesn't quite convince me, that was the part I spent the most time trying to get right xD
Regarding the shading, I think it was because I used an intermediate color in the shadow area (just as an anti-aliasing attempt), plus an extra color matching or slightly brighter than the shadow color where the fluorescent/neon parts are to create a "bloom" effect (I did the same for the screen faces). For the rest of the shadow projection, I used the vanishing point method, though only partially, since I’m not very experienced.