I don't know why, but I just get the feeling that these are siblings, or maybe step-sibs in the way that wild horses have children. So big bro is indulging a playful whim of hair grooming from his sis. Filly: "You know, you should really braid your hair sometime. I wonder what it would look like braided on the side." Colt: "It would look girly." Filly: "No it wouldn't." Colt:"Yes it would." Filly:"You don't really know unless you try." Colt: Sigh of longsuffering. "Which means you're going to try it." Filly: "Pretty much, yeah."
I really like the casual curving you have to your lines and the shading and sketch effects. The anatomy is almost-but-not-quite, giving them a mythological rather than realistic feel. Because let's face it, if they were real, her hooves would need to be wider. She has such dainty feet. I'm surprised his fetlocks are not shaggier given his mane and tail.