Define the Shape of the Arms
The arms are made up in the same way as the rest of the sculpt. The best stamps to use here are still the Mechanical ones. Start by creating some cylinders using the line brush method to create the basic arm structure. Remember you can push forward or pull back with the Tool hand thumbstick to increase and decrease the size. Add a lot of visual interest with really complex stamps and make sure that the layer resolution is set high enough before adding clay in order to avoid rough or jagged edges.