Few pointers.
-Tile variation is important. When doing dirt and grass, make sure to use more then one tile, three is usually a good amount. Add grassy dirt where dirt meets grass for a good transition.
-Fog. Go to Scenario, Map Options, Fog. Set the color and Z-Start and Z-Finish. Just mess around with it until you get what you want. For a typical terrain, use a light blue. This adds the atmosphere is a way. It makes it look more real.
-End of the world!! Your terrain looks like it ends right behind the hills and house. Make sure the viewer feels like the terrain goes on forever. Fog is helpful for fading out slowly. For this terrain, all you need to do is add some trees behind the hills. Maybe add mountains in the far background. This isn't always easy, but it's important.
Keep up the good work. I like the use of doodads.