Character sketches
Turn arounds
In action poses
Props that make the character unique
Rendering method varies depending on the final delivery system ie: film, television animation, game design, toy etc.
Character Concept Student Example:
Concept Pitch for Elle, includes text > Alysha Lach
Turn Around for Elle Concept > Alysha Lach

Character Production art will be the finished art. It will be developed in the assets that are needed for the final (for example a 2d animation character production piece would include the rigged character including all the assets such as multiple mouths, multiple eye movements etc.)
Example: Jeremiah Johnson Production Art for Princess Natasha Animation Collective, see more at JBULLFROG.COM