From the Model Mayhem FAQ:

I'm not a member and just want to use someone’s work. How can I do that?
Model Mayhem is neither an agency nor a manager and we do not own the images displayed by members on our site - we are simply a website where talented individuals come together to network for jobs.

As such, we don't facilitate the licensing of the images on our site. You will need to reach out to the copyright holder of the image to request permission to utilize it. Typically, this is the photographer of the image and not the model in the image.

If you would like to do this through Model Mayhem, we recommend signing up for Talent Recruiter profile so you can post a casting call for the images you need.