Critiques? Can't think of serious negative ones, considering it's stylized and works well, but I can point out positives. Great shape of the head, very nice work with the helm and crown shape in it, gorgeous wings for a "chibi" version in particular. Nice use of simple shading to convey a metallic reflective look on her regalia, as well. And grest expression in the face. The one thing I'd point out otherwise is the ears - they're more feline or canine than equine, and while pones don't have 100% equine ears, it's the equine features they retain and not other species'. Aside from that, great idea for the cuteness.