Like most painters, I was lucky enough to use my wife as a model. She was attractive, was usually somewhere nearby, and didn't overly complain.
When we were first married, I used her on many occasions. These were not necessarily for 'portraits' as such, but usually as a figure in a composition. The one above lives in our bedroom; she particularly liked it, so it remained unsold.
I have always hated sitting for portraits, I become bored after just a few minutes. Even photographic portraits I find tedious. Lady M was always more relaxed, and could sit for about 30 mins without complaining. I also tend to shout a lot when working, which doesn't help.
My children were all terrible fidgets especially when they were very young, which was the age when I preferred to paint them. I was lucky if I could get them to sit still for 10 minutes which meant I had to work quickly. Most of those portraits remain unfinished.
I've also painted portraits of dogs, but that's another story.
It's been years since I painted a self-portrait, but I'm thinking about it. Maybe the time is right (as long as I haven't forgotten how it's done). I'll probably become bored quite quickly, and no doubt start shouting at myself.