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.
Step 2: Sculpting
Start by using the Grab tool to pull out the neck and nose shapes.
Next use the Sculpt Out brush to add basic facial features (At this stage concentrate on face shape instead of the detail).
The Flatten tool helps to give clean simple form. Use it on the jaw line and eyebrow ridge.
Keep checking while you are modelling that you have Symmetry on. You don't want to find you are only working on one side of the face.
Always save your work when you have made major changes.
Make sure you have a few different saved versions in-case you make a mistake.