From the Model Mayhem FAQ:

How can I get Google to delete my results or images?
Unfortunately, we have no control over search results and cannot do anything outside of Model Mayhem to help you here.

Please check out this article to learn more information on Google's caching and removal process:

While we cannot guarantee this will work, this link may help to remove changed content from Google search results:

This tool from Google will only work if the content on Model Mayhem has either been updated or removed. If you need assistance in getting this content updated or removed, please contact the moderation team with the links to the specific content.

If you have an image you need removed, we will need the link to the portfolio or contest page where that image appears and NOT the direct link of the image.

Google also has this article about removing images from search results. Please check it out for more information: