Wow imma try and look at new okie :3

It's kinda hard to explain sorry

Put the eyelid closing halfway through. In the next frame, put the eyes closing fully. In the next next frame, put the eyelids closing halfway through again. And you're done! Thanks for asking

two*

Actually, in normal speed it's not smooth. It takes too frames. I thing it looks smooth because I put the speed to full speed. Anyways, in the frame where you want to start the blink,