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In the customhorses folder, you have two images: customhorsetemplate.png and customhorsetemplateBG.png!
The first one is the drawing on top of everything, the black lines.
The second one is the part you can recolor. (You can ignore this part if you want, and bake in the color in the first image!)
When you have your set done, leave them in the customhorses folder. They must be PNGs!" this part confuses me. where do i do the drawing?