Cartoon faces - https://www.youtube.com/watch?v=nDTAzOrH4AM
A cartoon character - https://www.youtube.com/watch?v=61qUZgdH-aI
20 different facial emotions - https://www.youtube.com/watch?v=4za5eEmkcCM
Optical triangle illusion - https://www.youtube.com/watch?v=ZW0evffIxEM
Optical oval illusion - https://www.youtube.com/watch?v=XCx-Hl7jzNg
A dragon (this looks SUPER hard!) - https://www.youtube.com/watch?v=GCagUfe84mQ