(medium full shot) of (astonishing pearlescent aquatic creature

(medium full shot) of (astonishing pearlescent aquatic creature) with smooth skin, shell-like armor, ribbon-like fins, bioluminescent patterns, tail, bioluminescent hair, pearl ornaments, set in a mystical glowing bay, with calm waters, luminous plants, hidden nooks, ethereal beauty, at night, Masterpiece,best quality, photo, realistic, very aesthetic,