Small Town Girl,
It's hard to see from your pic if your horse has a "solid" black head. If so then he is a ROAN. If his head is greying as well then I'd say grey..
Greys get lighter each year, Roans change seasonally when they shed but the head stays dark. AND one more tip.. On a True Roan if there is an injury the spot will grow back in base coat, black on a blue roan, Bay on a bay roan sorrel on a red roan etc.. Make sense?