‘Take a look at yourself in the mirror’ does not imply you need to look at yourself merely, but instead, you should look at what and how others may see you. A noble quest and possibly a helpful suggestion that will likely not bear the intended results.
Just as with Snow White, asking who the fairest was of them all, the mirrors we place up to ourselves are fraught with our bias. If we stare at it, all we see is what we believe, conjure up, and embed into our psyche. We do not see what others see, both the good and the less accepting.
Being offered an alternative perspective can enrich us and help us grow when delivered with care, respect, and consideration. We should seek out an objective, reflective mirror, and if in return others seek out our perspective, be sure it is kind and constructive.