Yes, I've been able to do it easily before. There is no prompt or link to change it now. I thought maybe I missed something. I guess contacting someone is my next move.
About a year ago I changed my avatar and @ronandannette objected. She appointed herself my Avatar Approval Queen and “suggested” I use the Toronto Raptors dinosaur mascot.
I liked it, so why not? Don’t worry, I’m not about to change it.