Agreements with artists and photographers whose images I license.

Most of my designs include decorative accents and background pieces (flowers, swirls, sheep) that I have bought and cannot sell.

The designs are not digitized for resale and there may be an occasional unnecessary trim that I haven't fixed, so they're not completely tested and debugged.

the most important reason (to me) is the selection of the right thread color that makes or breaks a design. I own just about every gray and brown/tan/mahogany thread, and the difference between subtle shades is mind boggling. I will frequently stitch out a design a dozen times to get the right combination with adequate contrast and tonal values, and the thread brands I use are not available in local sewing retail stores.