Illustrated glowing blue-scaled mermaid swims serenely

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This ethereal fantasy digital painting features a luminous mermaid with long flowing dark hair, iridescent turquoise-blue tail, and shell top floating between elaborate retro-futuristic steampunk underwater buildings. Soft sunbeams filter through hazy deep blue ocean, casting a calm magical mood over the submerged mechanical city dotted with warm glowing orange accent lights. The cool dominant blue color palette paired with warm small details creates a dreamy, whimsical steampunk fairy tale aesthetic.