Awesome! i suggest giving my free zenith lighting system a try. It produces daylight such as this very well! You can download here: http://www.renderring.com/models/zenith.zip Disable the sun when you use this. You may have to adjust the light rbughtness to fit the scene. It produces soft shadows with the default render settings so it won't increase the render time much. For the fence, you can open the elevation map in photoshop and play with the "zigzag" filter under "distort." Only other thing i can suggest is increase the bump height of the dumpster texture. it looks flat from this angle.