From YPPedia

When commissioning a portrait, the pirate's portrait pose will be determined by either the pirate's portrait item or clothing. If a pirate is holding an item, it will usually be in the pirate's right hand, and the left arm will be by the pirate's side or placed in a jacket pocket. A few of the bludgeons are held in both hands. If no item is chosen, then the pirate's upper-body clothing determines the pose.

Male Poses

Apron	Bandolier jacket	Belt and bracers	Cape	Captain's jacket
Chainmail	Conquistador armor	Frilly shirt with sash	Jerkin	Rags
Shirt with sash	Striped shirt	Striped shirt and vest	Swashbuckler's jacket	Vest with sash

Female Poses

Apron	Bodice	Buccaneer jacket	Captain's jacket
Chainmail	Corset	Dress	Frilly shirt with sash
Midriff blouse with scarf	Rags	Striped shirt	Striped shirt and vest
Tabard	Tudor bodice	Vest and scarf	Shirt with belt

Skellie Poses

During the Halloween events of 2008, pirates could create portraits of themselves as skellies, zombies and ghosts. For zombie and ghost portraits, pose is defined by the upper-body clothing or held item, as per normal portraits. However, as skellies can wear no clothing save hats, they have only one available pose for each gender. A skellie with a hook will hold the hook in front of the pelvis.

Male skellie

Female skellie