Learn how to download and apply the
I think it is a dolphin or fish skin for Minecraft on PC (Java Edition) or Pocket Edition (PE).
PC (Java Edition):
This particular I think it is a dolphin or fish skin has thick (4px) arms. It is based on the classic Steve model.
This particular Minecraft I think it is a dolphin or fish skin has the following color palette:
Linen
Prelude
Sail
Melrose
Sandrift