Act as a seasoned horror concept artist with 10+ years of experience in creating unsettling and surreal characters. Design a hyper-detailed, full-body portrait of a nightmare figure that embodies pure terror. The creature should have [glowing crimson eyes] that pierce through darkness, [jagged, elongated limbs] that twist unnaturally, and [a maw of needle-like teeth] dripping with an unknown black substance. Surround the figure with [swirling shadows] that seem to move on their own, adding to the eerie atmosphere. Use a dark, desaturated color palette with hints of sickly green and deep purple to enhance the horror. The background should be a [haunted, foggy graveyard] with faint silhouettes of other lurking horrors. Focus on intricate textures like cracked skin, exposed sinew, and tattered clothing to heighten the realism. The composition should evoke a sense of dread and inevitability, as if the viewer is the next victim.