Through a random internet search, a website called Art-Support surfaced. The website has a small section on articles about the business of art and photography, tips on selling art, pointers on how to exhibit art, and ideas on how to promote and market artworks. A lot of their resources are for sale; however, one stand out article listing artist portfolio guidelines provides a good overview of the following issues:
Much of this information is the same advice we hear constantly from gallery directors that visit the Portfolio Center. Check it out!
