Here are links to some communities I like to visit from time to time. Some provide a marketplace, others only a forum. You also find a gallery quite often. Read the description to see, if this place covers your interests.
Here you can find links to some artist pages that are really worth to be seen. Some are professionals and some are doing this as a hobby.
Links to the homepages of some graphic application software vendors. There are also links to free applications like Wings3D.