Ultra-realistic illustration and highly detailed digital render of a panoramic view in a shadowy underground cavern, abundant with gigantic, vibrant crystal formations reminiscent of works by Greg Rutkowski and Thomas Kinkade. The scene showcases colorful crystals and gems, meticulously detailed, vivid and alive with color, set against a backdrop of darkness dotted with mineral deposits. The atmosphere is cinematic, with high contrast and HDR quality that creates a magical and hyperrealistic feel. The crystals and geodes exhibit smooth textures, and the overall visual effect is enhanced by an artistic bokeh and depth of field. The scene is rendered in 4K using Unreal Engine, emphasizing its otherworldly beauty. Avoiding common artistic pitfalls, such as poor anatomy or proportions, extra or mutated limbs, and blurry details, the illustration ensures an immersive experience free from errors, focusing instead on the awe-inspiring splendor of the underground crystal cavern.