There are three main techniques of sculpture in the round which mainly include, casting, carving, and assemblage.
A sculpture is carved out of limestone. After it was carved, it was painted and gilded, meaning it had gold details.
assembling: The process of adding where artists create work by combining objects and attaching them in a certain way.
carve: Using tools to cut, or record, solid objects to create something (such as a carved image).
casting: An exchange process in which the artist modifies the image in a soft, wax-like manner, and is replaced by something that lasts as long as copper.
lost wax: A throwing technique in which wax is filtered and burned after molding, and then heated to allow the wax to melt, leaving a mark.
modeling: The process of making a hand-held tool or tools.
sculpture: Three-dimensional art intended to be seen on all sides.
Hence, these are the techniques used to create a sculpture, it mainly includes, casting, carving, and assemblage.
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