The elements generally look fine, but it's always hard to get a sense of how things fit together from just a small test piece. The dark shaded areas in the trees seem a little overpowering at full resolution, but aren't too bad at thumbnail resolution. It might be related to my over-sensitivity to line thickness variance in a piece that looks due to mechanical considerations (the linework separating the individual roof cells as opposed to the fence as opposed to the cart: experience tells me that the real-world scale of those things isn't quite in keeping with the scale of the linework). The hard shadows on the building and corresponding lack of shadows on the scene dressing (animals, carts, fences, trees) look a little odd.

Whether the clouds (and smoke and cart in the street) are useful is entirely a matter of the purpose of the artwork. If it's mostly a piece of art with some minor mapping purpose, then the clouds might be good as a way of breaking up things. If the purpose of the map is to help the viewer find things, then they might be pulling attention from the areas of interest that will be keyed to the map description toward relatively uninteresting areas.