the horse seems huge. I am not saying it's impossible, because there are coldblood horses around which can get that big,
but to me it definitely feels too big compared to normal knight horses (which always were on the smaller side and with a shorter back)
Making the legs 1 px thinner and the whole horse 3-5 pixels shorter (head smaller too) would help a ton with the size impression I guess.
Aside from that great work, love the value composition.