man you got some skill dude, i Love them! here is a drawing my stepbrother did for me for my Bday around 4 years ago, he did it with colored pencil, and burned the paper, i Love his style, and he is truly a great artist,
the main part of the masks are done in just paint because its simplicity is awesome! and the touchup work is done in fireworks! so yeah, the grainy textures are done in fireworks along with skin tone, hair blend and blood! thanks man!