Wanderer where did You get those awesome armors and helmets? You should definitely make some items pack!
The items are from different mods.
A little constructive tip.
Try not using real photos of armors, try finding a metal texture, search for it on google and you might finds something, and do all these plates one at a time, with many layers, it will take time, but the result will be much better.
Also you see where the armor ends, there is no shadow, it looks like the armor is stuck on the horse or glued to the horse, make a new layer under the armor and take a black brush.
Then paint on the outer edge of the armor, so it looks like shadow, after that, blur it so it looks even more like shadow, if you use photoshop choose blur tool with 100% exposure and draw over the black you painted, draw quickly over it so you dont take to much.