I knew a camp horse who was solid liver chestnut with a very thin stripe down her face, and two deep blue eyes. She was a pretty little thing, and a real sweetheart. Scout gets a lot of guff about his eyes. He has one bright blue and one brown. At some point he seems to have gotten into a wreck and part of his brown eyelid is missing (no clue what happened, it was before I owned him, and it doesn't seem to bother him now). When he gets excited mom thinks he looks a little crazy with his one blue eye bugging out and his fuzzy pony mane everywhere.
I think it gives his face character and expression.
It's definitely more common to see blue eyes in paints and horses with bald faces. The one two-blue-eyed horse I knew was Quarter and Morgan, no paint in her as far as anyone I talked to knew. Who knows what Scout is deep down. I do agree that two blues with dark hair around them is really pretty.