I LOVE THEM SM! I reccomend doing anatomy of them to practice their bodies and thier positions! For izuku, try practicing his hair. I saw that it wa made in a certain cartoon type of style and I know that theres a book made by the author of MHA and Shonen Jump that shows how to draw all the MHA charcaters as cartoons. I recommend buying it or giing to your nearest BJS (kinda like Costco but the New Jersey version- I'm a jersey girl from Jersey) They have many copies of the books so you could take a picture of the character/characters you want. I did that with Hawks since I couldn't buy it ^_^
Luv ya,
Keigo