Player Models refer to the textures that are placed onto a player or creature model.
Player Models are divided into areas that act as the surface area of the character (for example, the front facial area, left leg area, etc.). A player model will only allow solid color; transparency is not allowed on the model file except on the second layer, which is transparent by default; playing offline, dots can be left free resulting in pits in the skin. If a skin with transparent dots on the first layer is uploaded, the transparent dots will render as black dots in-game. The second layer can be used to give the character spectacles, visors, or other accessories (even a big face).