Run cycle. That's all there is to it. I don't think I have to explain it any further. Sorry for the small images, but I didn't want to ruin the whole thing by expanding each one to *roughly* the same size and then failing to get each frame the same size.
Thanks to @-SkyStar- 's project that I referred to: https://scratch.mit.edu/projects/1307379/ (and no, I did NOT trace their art. All art is drawn by me.) Test Animation #1: https://scratch.mit.edu/projects/386955647/ Test Animation #2: https://scratch.mit.edu/projects/404579985/