Nice one! I love the details of the roofs.
The slightly blurred shadows have my preferrence, but I also think you need shadows for the roofs and probably in the forests/land topography too (to break the "flat" sense of the trees, especially). That's why I often have 2-3 layers for the different shadows on this kind of maps.

And I would have another critic. As your line art is really nice, right now, I think the texture cloudy effect of the water looks a bit weird. But that could get interesting if you add colors and a layer effect, though.