- 3 poses total
- in game The Sims 4 Poses
- place two teleporters in the same spot to pose
(mermaid sim needs to go swimming first, so the tail appears and then use the teleporter.
alternatively, you can use a CC tail, like this one OR use a cheat to get the mermaid tail on land:
traits.equip_trait trait_OccultMermaid_MermaidForm )