Herculean means great strength or effort, which makes no sense it's not that bard to gaze at yourself in the mirror all day. Narcissistic means full of yourself which so far best fits the sentence using context clues. Promethean means relating to the characteristic of yhe demigod promethius so rebellious and creative which doesn't work. Finally siren means alarm. So out of all the options, narcissistic is best.
