nothing turns my crank like a well-designed "abstraction of reality"!
I agree with what people have said in relation to the building outlines - they do come as a bit of a poke in the eye with the contrast between the green of the vegetation and the strong orange of the buildings. Buildings in real life don't have outlines (does anything actually have an outline in real life ..?) but a "representation" of a buidling could if it was appropriate. I think you're buildings might get lost a little without the outline so maybe may it a little less strong. Looking at the map from a distance it is the buildings that stand out the most - if the purpose of the map is to emphasise buildings over features such as vegetation then go for it! Is there any way you could surpress the vegetation around the buidlings to get around the problem of trying to show trees and buidlings in the same area? Same thing for the streams and rivers I guess: if you map is about waterways then don't obscure them with vegetation even though that is what you would expect to see in reality
It's really impressive work all the same - it's always interesting to see how people interpret making a real-looking map. I like the subtle green colours: they're very fresh.
I've taken some liberties with information in some of my work - it may not precisely represent what is on the ground in real life but as long as it looks plausible and accurate then it shouldn't draw the eye.