Hi Tracyf79 - I think that you have a good start here, The house doesn't look right for a couple of reasons. First you need to check perspective. If the house is up on a hill you will be looking up at it somewhat, so you will see some of the underside of the overhang. That's my second point, the roof looks to be the same size as the walls. Roofs should be wider and longer than the house to provide the overhang. Because it is so far in the distance, you don't need much detail - just a silhouette actually - with the right shapes.
You can also consider some shading, on the trees and the ground. Figure out where you want the sun to be and put in appropriate and consistent shading.
Hope that helps.
Give a man a fish and you feed him for a day - Teach a man to fish and he will sit in a boat and drink beer all day! Joe V.