lastunic0rn, a beautiful white unicorn standing ankle-deep in a shallow forest stream, elegant slender body, long spiraled horn, flowing pale mane, curled flowing tail, head turned slightly toward the viewer, quiet watchful expression, full body, enormous ancient trees surrounding the clearing, moss-covered stones, ferns and tiny wildflowers along the water, reflections rippling around its legs, distant woodland fading into lavender mist, shafts of warm golden evening light passing between the trees, deep violet shadows beneath the foliage, serene enchanted atmosphere, wide environmental composition