This Instructable will be In two segments. The first sculpting the Witch head, and the second sculpting the arm and apple.
You will need 123D Creature available from the Apple App Store.
The final Witch model can be found here in the 123D Creature Gallery.
With the final model you can produce a 3D print. How about a bookend, a shelf ornament, a Halloween tree decoration. Or just a 2D image to print out. Try 123D Make and create a cardboard model at home.
Step 1: Creating a Basic Shape
123D Creature has a set amount of polygons, so you don't want to waste any.
You will start with a stick figure but you will need to turn this into a ball.
Use the create tool to add and delete skeleton appendages as shown to create the ball shape.
First delete the legs, head and then arms.
Next use the Shape tool to make the ball round.
By adding a nose skeleton appendage, allows more polygons in that area so you will have more to work with later.
Once you have finished, press the Bake Skeleton button.