Are the circle symbols floor drains?
If so you will find floor drains in your stalls to be clogged 100% of the time (Unless you plan to use no bedding at all). And why do you have them in the aisle way? Floor drains are a great thing but in a barn they are constant clogging issue.
Things that are missing:
Space for muck bucket, wheel barrow, pitchfork, broom, etc.
Location for water heater (I assume if you are going so nice with everything else you will want tempered water to wash the horse with).
You will want the sliding doors on both sides to be big enough to drive thru the barn. 10' wide is the smallest I would go.
You might want to make the stall doors not open so the receptacles and the hydrant are so accessible to a busy lip.