An artist might consciously choose to incorporate art elements that reflect a lack of ability, such as uninformed and poor rendering of form with haphazard distortions, hesitant outlines, perhaps with uncontrolled painting/drawing “outside the lines,” or the artist might unintentionally manifest a crude aesthetic due to lack of ability.
Conscious adoption of a crude/clumsy aesthetic by an otherwise skilled artist might be done in order to reflect the characters or settings being portrayed, or it might be chosen to create works that fit into art scenes that eschew skill and beauty. A crude aesthetic might also be consciously adopted to make a piece suitable for a setting that demands something shoddy.
Featured: The Potato Eaters by Vincent Van Gogh.