I switch mine occasionally. I guess it depends on what mood I am in. My LinkedIn profile currently has this:
Since I want a sample of my art on my profile, I chose this small section of a larger piece I had done for Analog Magazine.
One day, I randomly asked for a suggestion on my Facebook Page for a project. Some one suggested I paint their profile picture. Hmmm. Interesting. I thought about it for a minute and decided it would not only be fun, but it could be good practice on how to get a painting done quickly. Well, I did it and it did turned out pretty good.
It's 600pxi X 600pxi and I did it in ArtRage Studio Pro in about 3 hours. I actually didn't want to spend that much time on it, but I was having so much fun experimenting and messing around with it, I went a little overboard.
SOOOOO, someone else has asked me to do there's and since I'm such a sucker, I said I would. For nothing. I think I'm going to do this one in black and white though. The photo ref is a little iffy, but I think I can work with it.
If you'd like your profile pic done, drop me a line on my Facebook Page and I'll see what I can do. I'd like to charge $50 USD for each, but I may do it for nothing. Depends on what mood I'm in.