Mysterio, also known as Quentin Beck, was a special effects expert in the Marvel universe. He was originally from Earth - 616. Beck was a brilliant but egotistical man. He created elaborate illusions using his skills in special effects and holography. Dissatisfied with his lack of recognition in the movie industry, he turned to a life of crime. He decided to use his skills to deceive the world and make a name for himself as a super - villain. He often used his illusions to create false threats and then 'defeat' them, making himself look like a hero initially, but his true motives were always self - serving.
One key element is his background as a special effects expert. This gave him the ability to create illusions. Another is his sense of being unappreciated, which drove him to become a villain. Also, his egotism played a big role. He thought he could outsmart everyone with his illusions.
No, they're not exactly the same. There are often some differences in the portrayal and abilities of Mysterio between the comics and other adaptations.
You need to start with understanding the basic structure and proportions of the head. Study Marvel comics to see how they depict different characters' heads.