Sorry to be the devils' advocate again.
And to make it clear - I would never ever be able to do sculptings like that, it's truly a great piece of craftsmanship.
But the horses are way too small in comparizon to their riders. Even cossack horses, which were usually of a smaller, shaggy race, would have been a bit larger.
Would it be possible to provide these riders with adequate horses? Pleeeaaaase.