The only issue I see is the different degrees of blurriness. Some of the trees are sharp, others are soft, ditto for the one city on the right, and the coastline and sea lines/woodcut effect. The mountans and hills are so nice and crisp (great work on those, btw.), it makes the softer objects stand out...

These differences give the appearance of something pieced together rather than created all at once.

Did you use different scaled brushes? Sometimes that can cause fuzziness.

-Rob A>