Collaboration - Elementary School Art Auction Pieces

This is the Kindergarten Classes Collaborative Piece 22"x17"

On top of the individual and collage art auction pieces I've created a collaboration piece for each individual class. My collaboration pieces are a mosaic puzzle of an image. Here are my steps:

1) I created the piece on an 8.5x11 piece of paper with just the outlines (like a coloring book page.) 
2) I then blew it up on a copier so that it became a 22" by 17" piece.
3) Using oil pastels, I matched the colors to the original inspirational painting.
4) I cut it into squares depending on the number of students in my class. (16 or 24)
5) I laminated the squares individually.
6) In a plastic bag I put the the individual laminated square, and the identical uncolored square, plus the oil pastels used to color in that specific part.
7) I know my students abilities so I made sure to match the artist skill to the complexity of the square.
8) I'll spray a fixitive on top and mount them together to create a single piece. 

This is the first grade collaborative piece 17"x22"