How is a T- highlight applied?

Answer 1

a t-zone highlight is the area of your forehead and down the nose. But for a better highlight, I usually include highlighting the part between your nose and your top lip and the part under your lower lip.

check this link out:
http://www.kevynaucoin.com/lessons/?highlighting

it covers info more than just on your t-zone.

Answer 2

a t-zone highlight is from the tip of your nose up and across your forehead...