I really hope I explained it well ;; u;;
And I hope this helps you!!!
This is the Gif I did for this tutorial!!
If you have a question I will try my best to answer and help you<33
This should work for any version of Photoshop that has animation
I don't USUALLY go open-closing-closed-opening-open but if you want to you can but I's use the opening and closing as the same layer
Don't go Open-Closed-Open doesn't look right.
Oh and don't do multiple closing eyes, It will take way to long and it will make it look like your character is in slow motion
Less frames to the keyframe(main frame you're going to) the quicker it is
The more frames the slower it is.