When everything was said and done I realized that I needed another pocket for my Windsor & Newton travel watercolor case. I cut some more denim fabric from the old pair of jeans I had. I boxed the bottom corners of the pocket to make the pocket very roomy. I had to hand sew it to the base because I had already adhered the base to the purse.
I decided to put my ink pen, water brush and stick eraser in the front pocket, they fit snug enough where they won't fall out.