It is a little hard to tell from the angle of the picture, but it looks like the left horse's right eye is either too high, or the left too low. A little more definition/shading under the right eye of the lighter-colored horse would help, that area kind of looks blank, but horsies have some shadows and definition of the eye socket and the veins and muscles below the eye - kinda his "cheekbones" if he were a person!
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