Aye, I think the scene is fine, only the POV is off. Notice how much empty, dry space there is at the foreground and bottom right? Take your camera up a bit, and toss some rocks and dirt and grass down there. Not much, but something to fill the emptiness... Also, lighting. Turn off the sun and try relighting the scene with radials, or a few key spotlights Targeted at key objects. Once you're satisfied with that, perhaps try tossing in a small light dome to fill out the shadows. Don't bother with millions of lights, just try a 16 or 20 light dome approximately where your sun would be shining from, might help add to realism...?