The following charts were made by spudilike (V3 Drawing Chart) and JamesChaplin1 (V4 Drawing Chart) with information submitted by TamaZone members in the Project Zone forum.
V3 Drawing Project
V4 Drawing Project.
They show what each of the different V3 and V4 characters draw when they use either the Pen or Pencil item from their Items list. In addition to the animation seen where a bubble appears above the characters head and they appear to write something in a diary, they can also draw a picture specific to their character. The charts show that picture specific to each character.