This creature is a demon from Egyptian mythology. She eats the souls of the wicked.
These three are from Norse mythology: Loki's sons Fenrir the wolf and Jormungandr the Midgard Serpent, and his daughter Hela, the Goddess of Death. Not sure I'm happy with the shading on this; turns out shadows are hard on the computer.
This dragon is Owl, my OC (original character; fan character) for the Wings of Fire series.