Carrie choses the scale. No sooner does she make her choice, do dark green scales start appearing. Almost all of her body is soon covered in scales, varying from dark green to brown and black. Her legs feel like they're being draw together by an invisible magnet, and they melt together.
Her legs and feet become one large mass, extending into a twenty foot tail. Her breasts grow several sizes, ending at what Carrie thinks must be a G cup. Talons burst through her nails, and her teeth fall out as sharper, more dangerous ones take their place. Two lumps grow in her mouth, which Carrie realizes must be venom sacs for her new fangs.
Her eyes turn completely black, and her hair falls out. Her now scaled covered head stretches, as a cobra hood forms. A forked tongue darts in and out of her mouth as the transformation ends.