This is the first of four videos I'll be making where I'll investigate types of eyelid rigs.
Download the files here: https://gum.co/EhEuL

Rig Method: https://youtu.be/XleNIUWoydY
Action Constraint: https://youtu.be/iG-xHq-8cmc
Eyelid Geometry: https://youtu.be/C1I11DhPzFs

0:00 - Introduction
0:42 - Add the shape key
1:00 - X-mirror
1:10 - Making the shape
2:40 - Cleaning up the shape
3:54 - Testing the shape
4:25 - Adding the rig
5:02 - Turning on x-mirror
5:36 - Duplicating the shape keys
6:30 - Adding Vertex Groups
7:00 - Assigning the groups
8:00 - Testing the groups
8:05 - Assign the group to the shapes
8:20 - Testing the shapes
8:30 - Adding the drivers
10:00 - Copy and paste the driver
10:44 - Testing out the rig
11:00 - Flipping the bone role
11:20 - Fixing the shapes and rotation mode
13:00 - Final thoughts

Drivers Master Class: https://www.youtube.com/playlist?list=PLbjn7kaP877u1sX4zl081V8jUeSHDY18G

Let me know if you have any questions in the comment below!
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Just a simple smart material that gives the mesh a top to bottom gradient and soft edge highlights. For stylized assets (think Dota etc).

Gradient edge colours is controllable just like any other layer.