Are your Pistoliers completely red, or just their front quarters like those GW Kislev with their painted on patterns you showed earlier? I can't quite tell from these pictures. If you posted the same three view picture you posted here, it could be affecting your score as it's kinda small and you can't make out details. Ultimately I think the red horses are affecting your score. Maybe it's the pictures but the white on the horses is contrasting really strong with the red on them. The color of their manes seems a little out of place as well. Taken by themselves I think the horses look good, and the pistolier riders look good, but I think they aren't working together so well. I'm a little surprised as you usually pick colors that work well together.
Also I just noticed, did you paint the horse's eyes white? If you did that's something that you almost never see, unless a horse is scared. They have very large iris/pupils. They usually fill almost the entire eye opening, with maybe a little of the white showing in the back upper portion of the eye. Take a look at some pictures of horse heads to see what I'm talking about.