posing

(photography) the act of assuming a certain position (as for a photograph or portrait)

he wanted his portrait painted but couldn't spare time for the sitting

introduce

This poses an interesting question

assume a posture as for artistic purposes

We don't know the woman who posed for Leonardo so often

pretend to be someone you are not; sometimes with fraudulent intentions

She posed as the Czar's daughter

behave affectedly or unnaturally in order to impress others

Don't pay any attention to him, he is always posing to impress his peers!