1. Vellum over a painted background
Materials: Vellum, pen and ink (or black pen), colored ink (I used copper, and two tones of green), background painted paper (I used mulberry paper painted with H2O's - shimmering watercolors)
Create your background. I wet the mulberry paper and then brushed it with shimmering watercolors (H2O's)
Keep adding details to your picture until you're satisfied
Add color with ink or gel pens. Vellum curls when wet, so be sure to use small quantities of ink. Decide if you want to add color to the front or back side. I added the trunk color (copper) to the back so that I would not lose the details on the tree trunk, and the leaves (2 tones of green) to the front so you can see the shimmer of the ink. I then went over the outlines of the leaves once again with a black pen, so the edges were well defined.