Assembly
First re-crease the fold on each layer. The front folds back and the back folds forward in an accordion fold.
Before you assemble this card attach the oval sentiment to the front. Then attach the backing colors to the house and the snowmen.
The layers go together by attaching the accordion to the front and back of the middle layer at the edge. This is what makes it stand apart. It also helps it stand up.
Your Shadowbox card is done! It fits nicely into an A7 envelope for mailing.