i know i've seen it done but i can't remember how. i think the easiest way is to make the image change to a transparent gif of it moving on hover
Look up CSS animations. It's quite the learning curve, but there's SO much you can do. Otherwise, the easiest is definitely just making an animated gif that loops? Unless you wanted it to move when something is done (hover, on click, etc.)
Am praying for you! Make sure to relax and take as long as you want! If making the twins portraits is too much, I am willing to do it. Maybe that will help?
neocities animate my shit challenge (failed)
maybe it'll update tomorrow like the tables did...