Create a highly detailed fantasy art portrait of a friendly, slim male troll with a humanoid face and long, thin, hanging ears. He is grinning broadly, looking directly into the camera while sitting at a campfire in a dark fir forest. The troll extends a mushroom towards the viewer, invitingly. The scene is a blend of dark fantasy elements with a soft, natural, yet surreal ambiance created by shimmering light particles. The composition utilizes 3D fractals and an octane render, trending in photorealistic concept art. The image captures an 8k artistic photography quality, emphasizing intricate details with soft, volumetrically cinematic lighting. This captivating portrait excludes disfigurements, blurriness, nudity, body hair, or any headgear, ensuring a perfect composition that immerses viewers in a mystical atmosphere.