Incredible piece, loving it.
Only one possible nitpick with the composition is that jousting happened the 'other way around' if we are talking about proper jousting indeed.
I mean they would encounter each other from the opposite angle, white knight on the left side of the black knight and vice versa, with the lances in their right hands aimed across their horses' neck to their left side.
The shields in their lefts would have not much purpose otherwise - as clearly seen here as well. ;]