This is sweet!
Never thought candy-based motifs & themes can blend well with your brand of dark Gothic characters but you proved me wrong otherwise with this! The fact that excluding the jade/blue touches & their eyes, everything about them is in contrast to each other, be it colour scheme or characterization. The soft cheek dots and their sleek self-conscious expressions is what associates them together and it would be interesting how they would interact when they are together.
My only gripe is that Candy-chan's hair curls are obscuring her upper arms deliberately; and I understand it's to showcase her unique hair in tandem with matching romper outfit, still given that you render healthy arm contours for your characters [link] [link] [link]
it does leave one wanting more of her. Anyways Awesome