Male and female kirin are sexually dimorphic in four ways:  
(1) Eyelashes  
(2) Eyeshadow  
(3) Whether their mane curls under their ears  
(4) Whether their “horn arrows” point in opposite directions
 
By “horn arrows in opposite directions”, we mean like this:  
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Note that if a kirin horn has an “extra ridge”, the pattern can extend up it, so the silver-and-gold kirin on the left still has horn arrows in the same direction: