We also have to remember that every culture sees "monster" differently. The Japanese have an entire mythos built around a woman who transforms into a fox, and the few things we might relate to that are the pointy ears and the fangs. :) But if you're doing this right, you ignore all that and look at what the Pacific Coast Natives found frightening, not what you want to impose on it. Natives found the blue eyes of the first explorers fascinating and a little fearful, so here, those liquid blue eyes might be bang on.