A menudo los maniquís no tienen cara para centrar la atención en la ropa.Mannequins often don't have facial features so that the clothes are the focus of attention.
Los maniquíes de la tienda premamá tienen el vientre con la forma del de una embarazada.The dummies in the maternity store have a belly shaped like a pregnant woman.
This means that the noun can be masculine or feminine, depending on the gender of person it refers to (e.g. el doctor, la doctora).