First of all, I really love this image. I have always been a fan of photographs of trees. I know they can be a difficult subject to capture well. The wide angle lens is one of the things that makes this image work, giving you the feeling that we are very small and looking up at Giants. The sun where it was placed does nothing but add to the visual impact. The one thing that bugs me is the chromatic aberrations. With some lenses at certain focal lengths and aperture settings this happens because the light is being bent a different amount depending on where it falls in the color spectrum. This can be straightened out in Photoshop after the fact.