All rendering software, particularly rendering software has a distinctive "style". A Bryce or Vue render is often easily recognizable. But when users get more experience they can (and hopefully) will develop their own style. This is not so much of their own artistic and creative input but rather its down to how the artists uses the lighting and environmental settings. You can set up a TG scene in a couple of minutes and it will look pretty much the same no matter who makes it, beginner or expert. I think were still finding out about TG's optimum settings for different scenarios. Like you say the more experience someone has the more their individual expression will come forward.
Richard