The tips i've learned over the years are start to off thin inside and go thicker as you go out. Using your lower lash line as a guy for the bottom part of the wing. i play around with that one. sometimes it works, sometimes it doesn't. I've heard people also do the 'dashes and then connect them all' trick but that doesn't go well for me.
I've mentioned this in the makeup thread but I like to outline it first with a liquid/pen liner then go over it with a gel pot liner. it will be incredibly bold and your wing won't fade as long as your makeup is good quality. I also line the inside of my upper lash line. Makes it look bolder to me.
I've been trying to perfect this look
and it's been harder than i thought.