Trace your bezel onto watercolor paper with a pencil. Trace a small triangle in the center (this will be your Christmas tree).
Use various shades of green to create the trees in each square.
Then go from lighter to darker blue to paint the space around the tree. Let dry completely.
Cut out the watercolor paintings to fit the inside of the bezels.
Seal the cut out into the bezels using the water-based sealer. Cover the surface of the painting with the sealer as well. Let dry.
Paint another coat of glue over the tree area and place seed beads on the tree.
If you have them, you can place a small metal star charm at the top of the tree, or gold colored beads. Let dry completely.