Here is an updated version based mostly on the suggestion given. Changed the sun position and angle, added a couple more layers of grass, changes the stones and added the tree. Rendered using the Cubic B-Spline (soft) method with bloom enabled to give it the glowy soft impression. 0.8 Detail, 16AA, 2/2 GI - took just over 42 hours to render most of which was the foreground.
It has a pretty radically different feel than the first version, but I like how it turned out.