From the instructions:-

Over 70 control cages are included with the program. This should cover the bulk of the most popular figures. If you find that your figure is not supported you have these options:-

1. Adapt one of the existing cages. Simply reposition/scale and export out the OBJ file. Follow the file name convention [figureOBJfilename-CAGE.obj] You could also use the Vertex Magnet tool to good effect.
2. Use a 3D modeling program to adjust an existing cage.
3. Make your own custom cages using a 3D modeling application see also the information on using the Vertex Magnet tool.

Cages should be symmetrical

Very little finesse is required it does not need to be exact. You could make one for just the front of the face with a few more or a few less vertices.  Just be sure to follow the naming convention. For Ryan that will be P8Ryan_HR-CAGE.obj and for Ryan2 that will be Ryan2_HR-CAGE.obj .

Please let me know if you get stuck but it should only take you a couple of moments.