Nice tutorial Hyde. I'm sure this will help quite a few people with that dreaded task of mapping ;)
Couple of things:
Even if your using the sphere to help you map, it still helps a lot to start all your heads on a 2:1 canvas (Like 1024x512). Then all your shapes will show up in-game just as you drew them on the canvas. (Credits to Pate5 for that handy tip)
Also, the top mapping isn't perfect with really fine things. From what I can tell Photoshop seems to use round poles for its sphere whereas Toribash uses a square for some reason. So its better to keep it nice and simple even if your doing this.
Top mapping issue