depends on the face and the color of your lips vs your skin. If you have darker skin + fuller lips, the look is nice because the lips don't stand out too much and make you look more friendly than someone with thin lips. If you're paler skinned though, big lips can look grotesque.
I think it also depends on if the lips are puckered out where you look like a fish, or flat. Puckered out usually gives you resting stupid-face
example, while flat makes it appropos
example.