A young adult deep gnome investigator, midnight black skin and smoky gray hair with a five o'clock shadow, sits in a dimly lit, cavernous setting. His face is etched with the weariness of countless investigations, his sharp, intelligent eyes peering out from beneath the deep hood of his black cloak. The cloak itself is richly detailed, perhaps showing subtle signs of wear and tear from years of traversing dangerous underground paths. He holds a long-stemmed pipe in his right hand, the smoke curling lazily around his head, adding to the mysterious atmosphere. His missing left hand is subtly implied by the way his cloak drapes, perhaps slightly bunched or uneven on that side, hinting at the absence without being overly graphic. The background might feature glowing fungi, intricate rock formations, or perhaps the faint glimmer of unseen machinery or passages, alluding to the subterranean world he inhabits. The overall color palette is dark and moody, dominated by blacks, grays, and deep blues, punctuated by the warm glow of the pipe and the subtle luminescence of the background elements. The style could be realistic with a touch of fantasy, emphasizing the character's deep-set eyes and the texture of his skin and clothing. The overall mood should be one of quiet intensity and thoughtful contemplation, reflecting the character's role as a seasoned investigator. The pipe smoke could be rendered with a slightly ethereal quality, adding to the mystical feel of the portrait.