Well, it's pretty good for a first try, but there are some points you can improve on
First of all, the shading isn't good enough. Some places are shaded much, while oter places are just non-shaded open spaces. Maybe change that?
Second of all, There's not really much to go, it just looks a bit empty. There isn't a route to the town on the small island either.
For the rest it's good. Improve on the points mentioned above, and it will be really good.
Edit: I just saw I made a pretty big bump, sorry about that ^.^'