Hello Anna
This is a pretty good first map. Its actually quite difficult to get a whole load of elements created by many different artists to work well together because everyone has their own idea about how a tree or a house should look and be drawn - never mind any general differences of contrast and tone, but you seem to have done extremely well.
The only thing that jumps out a bit are the shadows. Where there are shadows on the mooring posts in the water they disagree with the shadows on the piers, which are on the opposite side of the object casting them. The shadows on the buildings are much less defined than the mooring posts, and the tree shadows are darker than the house shadows, which is usually the other way around. Trees don't cast as solid a shadow as a house because of the gaps in the leaves. There are also things that have no shadow whatsoever, like the vehicles, animals and the sculptures in the fountains.
Just tidying up the shadow situation would greatly improved the overall effect, but its still a great first map