I'm glad they got Emiliano's permission, but it would have been nice if the artist actually made these concepts himself, from scratch, rather than use the concepts already created by another artist as his template. It's a nice effort, but when I see the obvious work of Emiliano under the added material, it ruins it for me. The person is obviously creative and has some talent. Let it shine through in their own work and not piggy back on someone else's. That's just a thought and my way of encouraging them to go for broke and make a full design.
As for the concepts, I am not a fan of the invented accessories; like the cat-o-nine-tails and ninja stars for Spinnerella, the nunchukas and heat seeking goggles for Flutterina, or the third snake face for Double Trouble (which in my opinion completely defeats the concept of the character being a DOUBLE agent. Her name is Double Trouble, not Triple Trouble). In my opinion, they don't feel right and seem like an attempt to make these characters something they are not. Nunchukas for Flutterina??? I mean, c'mon...Plus she can control swarms of butterflies, so why does she need a butterfly net? That's too small to do anything against a villain, and we already have a net themed character (Netossa).
I do like the addition of a second head for Sweet Bee, having her Filmation Helmet. That would be cool. I also like the idea of a bo staff for Spinnerella, since there are a lot of martial arts maneuvers involving the spinning/rotation of the staff.