I like the lineart on the truck. Eto horosho! (govoryu nemnogo russkiy yazyk)
Cafe looks better, now that you have some texture to the bricks, but it still looks flat because there are no shadows and the highlights are dull. You can add some dimensions to it by revealing the interior of the cafe and demonstrating the transparent qualities of the glass.
The sign is plain and I can't tell if it's neon or a billboard. Billboards have a cardboard-like texture and furthermore, I can't imagine why a billboard would have such a combination of colors. Neon signs should have metal ribs behind them and the bright green colors palette would match. You will have to choose one or the other before you continue. Another thing you should start thinking about is including some kind of graphic to include in the sign. Perhaps a burger and a coffee?
Truck
The paint job on the truck looks washed out. It should be shiny, right? This can be achieved with more contrast. Just up the contrast a bit, saturate the colors more and it should be better. The wheels should have darker tones of gray, and I've never seen a truck with Eisenkreuze for hubcaps, but I suppose you could make it work. The blue windows look better than gray, but they should have darker tones; bright enough to look transparent, though. What will really make the truck look real, once you've done all that, is the chrome plating on the bumpers and the reflective qualities of the lights on both ends. You really need to focus on these areas last and they need to have some wicked contrast. Once all that is finished, take a good look at the solid outlines and try to do selective outlining.
