I’ve spotted a weird glow in the northern woods, think you could help me sketch the creature once we track it?

Alright, I’ve been watching it from a distance and here’s what I’ve noted. The glow comes from its skin, a pale, phosphorescent hue that flickers when it moves. It’s about the size of a human, lean and wiry, with long, clawed fingers and a jaw full of sharp teeth. It doesn’t move like a human either; it shifts on all fours, almost like a giant cat, but the way it hunches and spreads its shoulders gives it a humanoid silhouette. The glow is brightest around its ribs and tail, pulsing in a rhythm that seems almost like breathing. No known plant or mineral in the area can produce that effect, so it’s probably some sort of bioluminescent adaptation. That should give you a good base to start from.