So onto some TF shots. The idea I had was that she could in theory be any kind of reptile but since she represents nightmares, a lot of people have a fear of snakes. So she'd adopt a form that was scary. Of course a lot of people are terrified of spiders but... Let's go with snakes, right? Besides a snake could bite a horse and some constrictors can eat whole gazelle so it makes more sense that a pony would be terrified of constriction or snake bite.

So her feathered wings would be scaly and draconic and her blue flowing mane becomes part of the cobra's hood. I incorporated two malevolent eyes there that can glow too so she could hide in darkness and have them glow to makle her look much bigger. As she becomes more serpentine, the wings would form the cobra's hood and along her back, there's be blue iridescent patches, like a diamondback pattern. Perhaps even an eerie blue glow.

Since this drawing, I ditched the spikes on the hood. I didn't like them there.

Art is mine
Character is Hasbro's/Lauren Faust's etc
What I've done is inspired by Gerald Scarfe :P I don't think Lauren had this in mind for her creations.