The last few times I made some of these it wasn't what I set out to do that day. This time it was deliberate. I'm not sure of the exact reason, but it has to do with a few things. The main reason is I cut my hair, and I really don't look like my most recent pictures. The second is I need some pictures online where I can at least pretend to look professional. It probably doesn't matter for Facebook, but may matter elsewhere.
I wasn't planning to use the hat for the color picture, but I hated something about every other picture I made with color in mind. The other two I was planning to hide most of my face, so the hat was mandatory. I may make one, or both, of those Facebook profile pictures (ironic isn't it... to hide my face for Facebook... ?) If I was a musician or an author, I'd consider one of the B&W shots for liner notes/biography pictures.
I've been asked a few times how I make self portraits. I use the intravolometer on my camera. I set it to make 10 shots/3 seconds apart. This means I usually waste one of the clicks while I walk under the lights, but I get 9 others where I can move back and forth and try different things. Its so much easier than setting the self timer and only getting one shot. But, I could probably have gotten 3 better pictures... easier... if I simply hired someone else to make them. Maybe someday.