Yeah it look's good at the moment nice work, yeah more tree's and path's would make it look better.
And he ment that to get a better appearance of the picture, go to:-
File>Saveto Bitmap. Then go to your Data Folder where the mapeditor is located should be a file named 'map' edit that resize it with a image editor and save as JPG as Bitmap uses too much space, like some BMP on maps are like 20 MB+.