Prepare a sketch of the sculpture you want to make. If you want to build the human figure, ask a model to pose for you while you make your sketch. Take a picture and use it as a reference when adding details to your sculpture. Write down the measurements of the sculpture.
Bend wire with a needle-nosed pliers to make an armature for your sculpture. The armature works as a skeleton for your work and also gives stability and sturdiness to a life-size sculpture. The shape of the armature depends on the sculpture you want to create. If you make a human-shaped sculpture, build your armature in the shape of a bone skeleton. Consult your sketch and make sure the armature is proportioned according to the drawing.
Prepare a stand for your sculpture. This can be a square of plywood or a block of plaster. Mount the armature on the plywood base and attach it using a staple gun.
Divide a block of clay in several parts. Knead a part of clay on a clean working table to remove the air pockets from the material and make it elastic and workable. Do the same with each part of clay.
Apply the clay on the armature starting from the bottom part of the sculpture. At this point, deal only with the major shapes and don't worry about details. Cover the entire armature in clay.
Add details to your sculpture using a needle tool and a hole cutter using the sketch or photograph as a reference. Use a wire loop tool to remove larger amounts of clay.
Allow the sculpture to dry completely. This can take over 48 hours, depending on the thickness of the clay, the size of the piece and the humidity in your home.
Sand the surface of your sculpture and remove any imperfections.
Fire the sculpture in a large kiln. Alternatively, cast the sculpture in plaster and use the mold to create a series of rubber, plaster or cement life-size sculptures.