What I like about Morrigan is that she embodies facets of both mythical being, The Morrigan, the Irish Goddess, and Morgan le Fey from the Arthurian legend, and that is what I was going for with this song too, embodying aspects of myth and legend.
Purple and indigo dominate, being associated with the crown and third eye chakras, respectively. Her human eyes are closed, yet she understand magic and the elemental and transformative nature of her connection to it. Indigo is also the colour of intuition and the night sky shines with stars to light up her face, for she must trust. Hands under her chin, she can feel the powerful magic that flows through her. The colour of her cape represents wisdom and independence, and it reflects the mystery that the Witch of the Wild is.