Gradient lips have become a big trend in Asia. I've seen many actresses in Korean dramas wear this lip make-up and also many net ulzzangs wear this too! It's gives your lips an innocent and fresh look.
I'll be using Tony Moly Water Jelly Lip Tint in Pomegranate and Wet n Wild MegaLast Lip Color in 900BP.
Basically you just cover your lips with a nude lipstick and apply lip tint on the inner side of your lips.