One piece castings? Awesome.
Just one thing though... charging horses will always keep their head up as they will want to see where they are going. Reining in the head will force the horse to slow down.
This is why folks say "give the horse it's head." By loosing the reigns the horse knows to gallop.
The rider will not only loosen the reigns but also will stand up out of the saddle and lean forward using the stirrups.
Generally, as a horse is galloping it will have one leg on the ground and 3 in the air or the reverse. The 3 legs moving at the same time give the horse it's speed, while the single leg maintains it's balance and momentum.
This is a great RL photo in illustration:
Having said that, they are very nice, miniatures.