Pretty much agreeing with what the two above have already stated.
In addition, I would also like to say that your map is very square-esque, in that everything seems too straight. For example the two left most islands and your rivers are for the most part fairly straight with no other details.
Mainly I would focus on what lolss said, and try to work in some of the flower ground tiles, as well as some more objects. Usually I try to put 1-2 items per 10 squares as a rule of thumb, but as long as you don't get too carried away (or not enough), the map won't look like a cluster/empty
mess.
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Former multi-server mapper.