Christmas card - Pop-up tree

I love both pop-up cards and origami so I decided to make cards that do both. I think the diagrams for the tree came from 'The Magic of Origami' by Alice Gray and Kunihiko Kasahara and the bells are in 'Origami for Christmas' by Chiyo Araki. A similar bell can be found in 'Quick and Easy Origami Christmas' by Toshie Takahama.