QH's Dad reminds me of the Canadian rodeo rider who taught me to ride Western - a man called Kennie Ross who came over to the UK in 1942 to fight in WW2 and never went back.
Look at QH's Dad's hands - two hands holding the rope reins. Held high up the chest by English standards. His legs are kept long and pushed slightly forwards. But his back is upright - even though his shoulders are bent (perhaps from ageing).
He obviously looks comfortable in the saddle.
To my eye the reins have a droop and allow the horse free movement of its head in what looks like a slow relaxed canter/lope to the right.
The back of the saddle, behind the cantle, appears to have risen off the horse's back???
There is nothing new in horse riding. The golden age of the horse in society was probably in 1914 before the combustion engine started to make its presence felt. We can learn back from those guys back then who rode for a living either on the prairie, the countryside or the battle field.