There are a couple of pictures of Don Eyles and his colleagues from that period at the bottom of this page on Don's web site:

https://doneyles.com/LM/Tales.html

It looks like in those days, having long hair was what made you a "weird-looking freak".

Perhaps pictures weren't considered necessary in 1971.

Or maybe by 1971 everyone had seen enough freaks that a picture was superfluous.