I think working with high contrast images as Day4Night is very hard.
I’m not sure if the bottom extension of the hills is helping with the composition.
You have the 3D elements well placed, and the tree is good.
I'm thinking I still might add some taller grass. Make it look more unkept. It's kind of funny. Who would mow this lawn? Maybe the guy who is barried up by the house. I could put in a shadowy figure pushing a mower.... or maybe not. :?
Tim Warnock - TheNextSide
Concept Artist / Matte Painter