What is a Gull Wing Lip Lift?

It's a procedure I do not recommend because it leaves a visible scar right in the kisser.
Secondly, it destroys a natural landmark, which is the vermillion roll. Go instead for the Bullhorn lift. The scar is hidden under the nose. 
Hope this helps!

Good day! For your guidance, the subnasal bullhorn lift is a technical variant of the gull-wing lip lift. This procedure involves the removal of either an ellipse or a curved-edge ellipse of tissue from under the nose. The skin then is raised, and sutured to lift the lip and expose more of the upper-lip vermilion. However, the downside of this procedure is it has a visible scar. Find a board-certified plastic surgeon and ask about detailed information on what type of lip lift suits you best. Best of luck! #RealSelf100

Thank you for your question. 'The Gull Wing Lip Lift' is another name for the 'Bullhorn Lip Lift' which are both more accurately described as a Subnasal Lip Lift. The 'Gull Wing' and 'Bullhorn' monikers derive from the shape of the planned skin excision in the subnasal area.

The Subnasal Lip Lift procedure is performed to accentuate the size and/or shape of the upper lip by removing skin from the region just underneath the nose. As the distance is decreased between the nose and the lip, the red lip is 'lifted'. In appropriate individuals, shortening this distance may impart or restore a more favorable balance to lips and face.