Ah, perhaps a website would be effective. A flipbook, or a pdf they can download, so you can take requests, and they'll have a wider range and variety to choose from.
I'm sure those ideas are already underway, and I'm telling you something you already know.
If you ever need help with a website, I'll offer mine!
On another note; the fact you hand sew this, is seriously hardcore. I also buy blocks of wood, and fine/sand/smooth down for knife handles -- and then I'll pick up a piece of leather, to act as tutorials for myself, and piercing that leather precisely, over a long period of time, takes some extreme dedication.