On the screen it looks quite nice, but next time try some shading, it will make your map better looking. Anyway, your first map is better than mine first map :)
7/10?
Someone will teach you how to shade sometime after this post. Try to stay away from making sharp edges; it doesnt make it look too good. Good job though.
I like the fact that you used such a daring background color. It looks really good!
Couple suggestions.
1. Try making less open space, too much is teh devil.
2. Shading is an essential if you want people to enjoy your maps.
3. Make sure you at least get near the scenery limit. It looks like you have, but i'm just saying it.