I love darker, muted colours (a contrast to my other like, pastels) as I think it portrays mystery, misguidance, being misunderstood, evil, death/dying, among other, darker themes I will not go into. However I am mainly centering things around "Mystery and being Misunderstood."
As you can see, Noira here is shrouded in darkness and in a darkened environment, sporting a dress that seems to be pulling her into the shadows and bright red eyes.
But behind the sheath of hair the expression the eyes seem to give is that of timidity and curiosity. Fear maybe. This is not a pet that is evil- but one who is mysterious and anonymous to her viewers and his misunderstood to be evil from her dark fur and feathers, to the pure white bones that lie beneath.