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Author information in search results [support.google.com]: If you want your authorship information to appear in search results for the content you create, you'll need a Google Profile with a good, recognizable headshot as your profile photo.
I didn't realize that it needed to be a headshot either. I'll have to change it back
Yup - and Google introduced rel="publisher" mark-up to take care of that case.
Until/Unless they do start enforcing it, why change it back?