As for UV-mapping, I recommend leaving a strip at the bottom for the leather neckguards, another strip for the decorative ribbons (use it for both the top of the head and above the neckguards), another section for the eye/noseguard (projected from the front), another section for the cheekguard (projected from the side), one section for the symmetrical floral patterns at the top of the helmet (use it for all 4 sections), and another section for the horse-head + mane and the decoration at the back, with another generic leather pattern for the inside of the helmet.