I think it\'s amusing that most of this is links to other links......anyway.......
try to highlight the top of the flanks of the horse two shades brighter than you think is necessary. Sweaty horses tend to look almost metalic.
brown horses sometimes have black legs. paint the horse brown, the legs black and have a zig zag border, then let a drop of each color blend at the border of each leg.
This pattern can also come with white socks, but I find that makes a mini look crowded.
Hooves are not always black especially if they are at the end of a white sock.
A heavy drybrush on the nose is probably the best way to color the muzzle