We might fancifully call them a pair of native pearls or uncut gems, lovely by reason even of their sketchiness.
"The Life of Michelangelo Buonarroti"
John Addington Symonds
A glass jar of pickle and one of olives added to the sketchiness of the table.
"Vacation with the Tucker Twins"
Nell Speed
We are still in the realm of sketches and sketchiness.
"Appreciations and Criticisms of the Works of Charles Dickens"
G. K. Chesterton