Okay, so I tried doing a dun. I hope that the blue on her neck counts as flair... I decided to extend the dorsal strip down the tail, then get lighter once it reaches the tuft. I own a dun horse actually, and I noticed he has these little spots on his legs that blend into his body color, so I tried that out. I was looking at reference photos for the hoof color, and I settled on a grey color. I did a little black around the eye, and made her muzzle grey. I didn't know if the muzzle color extended into the beard, so I just did a little bit.
Thanks so much for the opportunity! I''m not at all experienced in genes, but I think it's something like: Ee/Dd?