I use a pseudo not necesarily for privacy but to keep my writing world and my lawyer world separate. So yes, I use a photo of me for my author photo. I don't care if people recognize me. If they do, it means they already know me and I'm not ashamed for them to know I write.
If I was using a pseudo because I wanted to keep the writing a secret, I'd probably use a photo of me that was unrecognizable, such as a cleavage shot (no head) or me behind sunglasses or something.
A good (and probably not very pricey) professional photographer in your area could probably help you set up a photo shoot with several very different "looks"/personalities, that wouldn't even be recognizable as the same person post-editing, as long as you gave them a head's-up ahead of time that that's what you'd like to do. Just a thought.
You could also use your own photo and crop it to show only a portion of your face. Kind of like Seth Godin shows his head only from the eyes up. It is a great way to brand yourself, or pseudo, if you always use the same shot, as Godin does.
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