From right to left, this is my character Dark Amulet in her pony, anthro and human forms. The reason why the middle one has a grey cloak is because that's what the inside of the cloak looks like. Did this for 50percentgrey to see as a reference, hence why I drew the legs above them and the cutie mark. In the MLP World, cutie marks are marks symbolizing one's talent and are normally on the sides of the behind, and yes Dark's CM is the Alicorn Amulet as she's wearing it, just that it's behind the cloak covering it, but the gem can be seen on the front. Dark looks short here, but both her human form and pony form are 5 ft. while her anthro form's only around 90 ft., but can change as she can change her size.