Here are my other dead marvels.
I'v made some molds for making the skulls and I just use the air drying sculpt and add a little detail for each character.

Hawkeye, wanda, magneto, x23, deadpool & domino.

Last image has a couple of others I'v not shown here... Cyclops, daredevil & cpt. America.

I have a few more skulls already made so if you have any suggestions let me know.