Are these sculptures suitable for outdoor display?

Most antique and vintage terracotta pieces are designed for interior use because freezing temperatures cause absorbed moisture to expand and crack the fired clay. Display them indoors away from direct sunlight to preserve any applied paint or verdigris patina.

How can I tell the period of a bust?

Examine the style of the hair, clothing, and base, which often reflect the prevailing aesthetic of periods like art deco or the nineteenth century. Tool marks and the composition of the clay underneath also offer clues to age. Signatures or inscribed dates provide the clearest indication of when a piece was modelled.

What is the difference between terracotta and plaster?

Terracotta is made from fired clay, giving it a weight, porous texture, and warm earthen colour. Plaster is a softer gypsum-based material that is cast rather than fired in a kiln. Sculptors sometimes painted plaster to resemble terracotta, so close inspection of the base or chips helps confirm the material.