"A look" is a certain style of hair, makeup, and clothes. You can say what kind of look a person has:

She has a classic, traditional look.

I'm going for, like, a really edgy look.

That's a nice look!

There are other meanings of "a look" as well:

• The emotions you're showing on your face:

  She gave me an angry look.

• Quickly checking on something:

  A: The coffee maker seems to be broken or something.

  B: OK, I'll give it a look.