Hmm, its alright. I think it'd look better if you made a sharpen layer and erased some parts, it's a little blurry imo.
Doesn't look like much was done. All you really did was smudge/blur the render on one layer, put it behind, and added some c4ds
He was saying that it looked empty, (ie unfinished), so he just said good start. It's not a backhanded comment or anything, so try not to get defensive, hun. ^_^ I like it, but I agree with the above. Brighter colors and more effects would be schweet.