Another expression used at the point of sale is in the style of. While this may be true, the object will not be seen as art at customs. Inexpensive tapestries are generally not considered works of art but pricier ones may be duty-free. Drawings and sketches are duty-free if created entirely by hand. Once mechanical means, like a stencil, are employed duty may be imposed.
Pieces also have to be printed by hand to be duty-free.
Ceramics too, must be created by a professional artist. Craftspeople sign their work, too. The best bet for travelers hoping to purchase works of art abroad, is to visit recognized galleries. There they can obtain a history of the artist including exhibitions. Try to obtain a written statement regarding the artist and the item.