Colossus is a fictional superhero appearing in American comic books published by Marvel Comics, commonly associated with the X-Men. Created by writer Len Wein and illustrator Dave Cockrum, he first appeared in Giant-Size X-Men #1. His original name is Piotr Nikolaievitch Rasputin and is a Russian mutant, he is by far the physically strongest member of the team, being able to transform into a strong metallic form.
Colossus is a mutant with the superhuman ability to convert the tissue of his entire body into an organic steel-like substance (even his eyeballs). This substance resembling steel is of unknown composition but appears to be analogous to osmium and to carbon steel. He also possess superhuman strength, stamina and durability. Even without his powers he holds a physically imposing figure standing at 6 ft 7 inches. Though blessed with intimidating physical and mutant abilities, he is a quiet, honest, and innocent man who reluctantly agrees to use his powers in combat, feeling that it is his responsibility to use his abilities for the betterment of human and mutant-kind.
He is also a highly skilled painter, once becoming very famous using the name Peter Nicholas while suffering from amnesia.
I used pencil to lay down the rough outlines, a gel pen to ink and render.