11. the UV of the face prepared to be painted



12. now select the subdTess (poly Ciccio) and the poly proxy of the SubD and transfer the UV from the polygon menu



13. now assign, with the multilister or the Hypershade a shader to Ciccio Poly and one shader to the subd Ciccio



14. let's start to paint on Ciccio Poly and assign a texture, any size you like



15. I decided to start from white with the flood command (I am using the paint EFX plug-in)



16. I know it looks like an accident with a truck of tins full of paints, but please be indulgent, it is just a tutorial made in a few hours



17. Now come back in selection mode and made the shader of the Poly Ciccio completely transparent



18. Now connect the file texture created to the shader of the Subd Ciccio, just dragging with the middle mouse button the texture on the subD Ciccio



19. now select the Poly Ciccio and unhide the subD Ciccio



20. start to paint again but use ALT-A to avoid to visualize the edge of the poly Ciccio and start to paint



Final Image : OK I restarted to paint the model again, the truck was almost empty this time :)



That's all, maybe it could be worth it to write a mel to do it faster but I have the suspect that it will be available in the maya 4 release.So in the meanwhile, enjoy it.