This look is not the simplest to learn, but once you do figure it out it's really easy to get the hang of! You do your eyeliner as usual (eyeliner on top and eyelner on bottom), connect the top and bottom liner to make one straight line. Then place your eyeliner pencil right on your crease and just trace the natural shape. Extend this out to the length of the previous line you made. And you're done!
-This looks best on eyes more like mine-- Creased eyes that still have a little bit of lid space. This can change the whole shape of this kind of eye, making it appear more open.
-It looks cleaner if you just use a solid line, but blends better and looks more natural if you blur/blend the line a little bit (however do NOT blend the wing tip that you extend in your corners).