One of the most prolific sticker artists is Pobresito. Pobresito means little poor boy in Spanish. I’ve seen his work in the Tenderloin, Downtown, Civic Center, and the Mission. He could be covering Sea Cliff too, I don’t get out there much.
His stickers (presuming he’s a dude) nearly always depict women.
They often have a small caption or title, like ‘remove’, ‘lack of sleep’, ‘dead eyes’.