http://www.gimptalk.com http://www.deviantart.com http://www.planetrenders.net Those are the main source of resources that I use. Just a little tip, don't get too involved with smudging because in order to make it look good to you and to others, you have to understand what to smudge, where to smudge it and how to control it. So I suggest you to experiment with other areas such as vector, manipulation, C4D usage, and tutorials.