Does anyone out there have a good generic model release they use for portrait and/or general photography?

I'm planning on doing a series of portraits, but they will be done gratis and used to expand my portfolio. The subjects will all get one polaroid and an 8X10 print, but I will retain the negatives and rights to use/sell the prints, scans etc. I'm OK with the subjects scanning the print or polaroid for personal use.

After years of working in the Motion Picture and Television business I have some model releases used for those productions, but I was wondering if there was anything specific for still photography? Thanks.