A female Merfolk from the Tlann, Kingdom of under the sea in the Sea of Caritz.
In my world of Aiers, I have basically two "undersea" species: Merfolk -Tlannts- and Mermaids.
The true it's that I hadn't ever defined much neither of them.
For the Tlannts, I have two ideas: One is to make them not fish people, but related to sea mammals -as whales, dolphins, or even sea lions- or instead, as an amphibious ovipare race, related to sea dragons.
In both cases, they have legs because they don't live only in the sea.
Despise my indescition in them being mammals or ovipares, they are some of the few creatures, aside of elves, demons and dragons, to have maná, and therefore, "magic".
Because of this, sometimes they are called as Naiad, Oceanids, Nereids or Sea elf -thought they aren't related to elves-.
For the Mermaids, I have sometimes wondered, of making them or a myth among a mythical world -as pixies in Aiers- or make them some people.