A mermaid. Wearing a seashell bra. Long, iridescent fish tail. Flowing white hair. Holding a spear. Menacing expression. Chibi art style. Highly stylized. Ensure all walls and features are at least 2mm thick. Include bold, recessed features with a depth of at least 2mm. Maintain sharp, clean lines. Embossed features to rise at least 2mm above the surface. Recess etched details at least 2mm deep for clarity. DND.