Remove glass from picture frame and place over your pattern.
Add about 1 tsp of black acrylic paint to the Elmer's school glue and mix with a skewer in the glue bottle. Place cap back on the glue. Use the glue bottle to add black "leading" following the lines of your pattern. Allow to dry overnight.
Use your craft blade to neaten up any lines.
Mix your colors one at a time. Mix about 3 tablespoons of clear glue to a few drops of acrylic paint. Heavily add the paint being sure to go all the way to the leading. Even overlapping a bit is fine. All project to dry for several hours.
Use your black Painters marker to touch up the leading where the paint has overlapped.