I’m a pianist. Look at my hands!
The answer usually seems to be:
Show off their hands! Their hands that bring such gorgeous music out of the piano. Their hands that they protect and cherish and love. Their hands that they clasp, hold to their faces, fold together, drape on the piano, or hold in mid-air.
Everybody does it.
(Not all of these photos are awkward individually. Some are actually great. But once you start noticing that every pianist poses with his or her hands on display, it becomes a kind of collective awkwardness. Which we, of course, couldn’t resist.)