This is an intricately detailed digital illustration rendered in a style that is frequently associated with anime artwork. The palette is dominated by blends of light and dark blues, creating a dreamy, underwater atmosphere.  In the foreground, there is a girl standing on the right side, appearing as the main subject of the piece. She has long, flowing hair that cascades down her back and is colored in a pale, almost silvery tone that reflects the overall monochromatic theme. Her attire is a dark blue dress embellished with subtle star-like motifs that twinkle mildly, giving the impression of a night sky. Her posture is gentle and seems contemplative as she holds in her right hand what appears to be a glowing, spherical orb, which adds to the magical ambiance of the scene.  The background forms a semi-circular frame that resembles an arch, suggesting an underwater cave or grotto. The marine life within this space is fantastical, with several transparent, ghost-like jellyfish suspended in the water. They vary in size, are adorned with patterns of lines and dots, and emit a luminescence that illuminates parts of their bodies and the surrounding water. Additionally, there are hints of aquatic flora and bubbles dotted around the illustration, contributing to the sensation of a subaqueous landscape.  Throughout the image, there are chains of beads, seaweed, or coral structures that dangle from the top to the bottom, adding to the gravity-defying illusion of being underwater. Elements like air bubbles and gleaming dots are scattered throughout, enhancing the ethereal quality of the composition. Some of the bubbles encase diamonds, punctuating the scene with a sense of whimsy.  Lastly, the floor of this underwater scene is hinted at from the base of the image, where outlines of coral, sea plants, and anemones can be seen, as well as a scattering of luminescent items, perhaps stones or crystals, creating a boundary for the setting.  Overall, the use of light and shadow, combined with the translucency of the jellyfish and the glowing orbs, creates a serene and enchanting underwater tableau that feels both alien and peaceful.