Fantasy troll in a mystical forest, depicted in a photorealistic style with the incredible detail and vivid colors of an octane render, utilizing the powerful capabilities of the unreal engine. The troll's skin is textured with hyper-detailed wrinkles and earthy tones, reflecting a life intertwined with nature. Light filters dramatically through the lush foliage above, casting intricate shadows that highlight the troll's rough, stone-like features. Despite its imposing presence, there is an unexpected touch of whimsy in its eyes, suggesting a misunderstood creature in this enchanted setting, all captured with HDR quality and executed with an intentionally unrefined artistic charm.