Angrboda is the mother of three of Loki's children: Hel (or Hela), Fenrir, and Jormungandr; the three destructions.
Features to include when drawing:
Short black hair
Lives in the Ironwood Forest
She is a giant troll-like creature
The personification of misery
Colors: black, green - Splash Color = Purple
Don't depict her as "giant" literally, or gigantic, but roughly the same size as the Gods. Think larger than life, leader/queen of a realm or kingdom. The mythological depiction is a metaphor for reputation, symbolism, and/or what she is known for.
Angrboda represents and personifies, and is the source of influence as it relates to grief and/or misery.