Srabon bappy

You can make 2 drawings, open and closed, and in between those drawings, depending on the style, you can just squash the open eye drawing for 1-2 frames. I tend to vary the timing and spacing between opening and closing.

That’s just one way to do it though. It also depends, is it a quick blink? Casual blink? Slow blink?

Noice can be reduced by increasing the sample count from the samples tab render settings tab. Increase the sample from default 128 to 256 or 512, although it will increase rendering ring but you will get a very clear image.