My answer is the same as Philip Newton’s, which is the same as KP Wee’s. I do have photos of me, but whenever asked for an avatar, I rummage in Spotlight for “Nick Jpg”, which is rather slimmer pickings.
My avatar picture, courtesy of my wife, is me doing something uncharacteristic. Lying down in the park and taking in the sun. It’s a memento temperare: a reminder to myself to keep it cool…