Nice first render, very nice actually. Though I'm not particularly fond of the distant blur. Would be better without it. If you try for a photographic rendering, a frontal blur would be more likely, IMO. But there are ways in TG. I don't know if the public release has inbuilt DOF, but with a distance shader and clever masking you can apply those rendered masks later in Photoshop. Try the search button... it must be on the forum somewhere.