Mark_Wilkinson wrote:
I'm looking for models who would be interesting in trading headshots/social for modeling in stock photography. Would this be considered appropriate on MM?

It's quite common on MM.
Look for the term "TF" (TFP, TFCD... etc) which is an abbreviation for 'trade for' or 'time for'

Mark Salo wrote:
Use the browse function at the top of this page to search for models near you.

This would make a great avatar. Crop into a head shot as part of the avatar process.

...or just under the elbows.