I think that all of your pieces are well done. How do you get the material to stick to wood?
I was thinking of doing collages on canvas (maybe linen) and building up in places so that part of the piece is 3D but time is always against me
I like the Colombine piece the best because of the simplicity of the colors and the contrast.
Have you ever seen the artwork of Salvador Dali? A collage in that style would be interesting.