Part 3626bpx99 : Minifigure, Head Alien with Ghostly Gray Face, Eyebrows, Pupils Pattern (HP Peeves) - Blocked Open Stud [Minifigure, Head:Minifigure, Head] [BrickLink]
LEGO Minifigure Head YELLOW Male Beard Gray with Gray Eyebrows Sideburns | eBay
LEGO - Minifig, Head Female Gray Eyebrows, Eyes, Lips - Sad / Open Mouth Angry | eBay
Minifigure, Head Alien, White Teeth, Dark Bluish Gray Cheek Lines, Eyebrows and Wrinkles, Orange Eyes, Smile Pattern - Hollow Stud : Part 3626cpb3018 | BrickLink
LEGO® 28621pb0135 6455328 - ToyPro
LEGO Dark Stone Gray Minifigure Head with No Eyes and Open Mouth (Safety Stud) (92827) | Brick Owl - LEGO Marketplace