I like the town itself, but the trees need work. I am guessing you used a bevel on them? IMHO, it seriously clashes with the style of the town which is much more hand drawn and natural feeling.

If you are interested in trying to change them up, Something more like Mike Schley's style would work I would think. Or, go with something like this(the buildings IMMEDIATELY reminded me of Del's map..) Alternately, just consider highlighting each by hand(light/shadow) using a smallish grunge brush(might want to select to keep from over painting "outside" the lines...