Everything I’m testing should be invisible to you. If something is weird, then either I or the process got SNAFU’d.
I find it interesting when I take self portraits that I just can’t manage a very good smile. I’m usually pretty good about smiling for other people’s pictures, but for the ones I take of myself I end up with a lot of throwaways if I try to get a smile. So, I don’t bother too much.