I've found this a great site for finding the resources necessary to enhance a portfolio. There are some really helpful people on the site that are able to give great advice and help to both experienced models and those just starting out.

Adultfolio is a great site for Photographers and models to arrange shoots together, many profiles show specialist features and props that are not easily found, models of all ages 18-70s are on here too. The site is easy to use, and you can back up messages. Problems are easily fixed by admin if site upgrades effect it in weird ways. This site is the main site i use along with its sister site Modelfolio.