I love the colors in your quilt and it will work as is. However, my eye focuses on the mountain with all that texture rather than the house. Maybe a darker color for the moutain and a lighter color for the sky as in the original photo. The house seems well constructed but is lost behind the trees and flowers. Decide what your focus is and downplay the other features. The fence may should be your focus as it will be in the foreground.
I love the walkway with the stone and the lovely green grass and it will look great with a pretty fence.
This is really great for a first attempt. I am just beginning to try some art quilts, also, and know how hard it is to find and use fabrics for the various elements and still remember to consider value and perspective.
Have fun with this project and don't stress. It will be great no matter what you add or take away.