Adult Horse-Themed Coloring Book

I'm in need of a creative freelancer who can design a 20-30 page coloring book aimed at adults, with a horse theme. Simple design like "Cozy Coloring books" but for a new sort of coloring book more suitable for color testing and color swatches.

Ideal skills for this project include:
- Graphic design
- Understanding of adult coloring book trends
- Experience with creating themed content

Please provide samples of relevant work.