WAAPT Art Museum
Here is a gallery of commissions and other artwork created of the RP's characters, sorted by player. Images created in character creation tools do not belong here, though they're still fine on actual character pages and have their very own gallery here.
Multiple Players

The PEFE members as of March 27, 2012. From left to right: PEFE!Every, Pentigan, Luke, Silent, Tangent, Tagg, Tracer, and Umbra. Original is here.
Pipping Fool
Umbramatic

Waka in his true form by Luke924.

Issun as a Joltik by Luke924.

Duolis in her traditional attire by Pikaninja

Team Umbra groupshot. (From left to right: Umbra, Lina, Ammy, Arika, Nico, and Robin.) (Commission by Martha Napier.)

Ammy in her divine Arcanine form from Okamiquest. (Kickstarter reward by Katie Teidrich.)