Here are the four stages of the Alien life cycle explained with paper by artist JF Lemay. I stumbled on these as a single video assembled by someone else on Tiktok but prefered to link the original artist instead even though the whole thing is presented in 4 different videos on two different platforms.
https://youtu.be/pcSoyL1p_5w
https://youtu.be/0wNjHRIa4Lo