Hey, I found this really awesome Etsy listing at https://www.etsy.com/ru/listing/257728668/original-watercolor-horse-illustration
Original Watercolor Horse Illustration by ThePaperWoodland on Etsy
Great textures and balance of colours.
Literary Animals - Loris Lora
Visual alphabet, with horse illustration from 1953. Vintage colour palette with a retro edge.
Horse Running Geometric illustration Animal by tinykiwiprints
Sarah Gibb illustration of a knight on his horse in a beautiful forest
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dala horse, illustration, andrea lauren, ink print repeat, andrea lauren, dala horse, woodcut, linocut, folk art,