I spy with my "little" eye...
It's the Beholder's little brothers, the Spectator and Grazers. These are from Nolzur's Marvelous miniatures line.
The Spectator does have a mouth, it's filled with teeth, but given the angle of the shot, you can't quite see it.
Painting wise: Skin was contrast Ultramarine Blue, drybrush Caledor Sky Blue, drybrush Lothern Blue. Eyes were Whitescar White, Black slit eyes (using Micron Pen), Lamenter Yellow Glaze. Tongue: contrast Blood Angels Red, Wild Rider Red highlight. Teeth: contrast Skeleton Horde, Ushabti Bone highlight, Screaming Skull highlight. Gums: contrast Pink (something something).