Hi! Here’s my animation this lecture! I picked an image on internet and I tried to reproduce it in pixel art. I think it went well 
I decided to make the two parts of the animation in one, so instead of one going down slowly and one slamming down, it goes up slowly and then slams down! Here are the exports in different sizes :
128 pixels
256 pixels
512 pixels
And the original picture I had as a reference :
PS: I know, I know, the chains aren’t moving hahaha