Two doughnut shaped ones for the top piece 7(?) inches diameter, 2 pieces 8 1/4 in. diameter circles for top and bottom, one circle 8 inch diameter for the very bottom connector piece. If this is confusing look at a minifigure head and it may be more clear.
After the two newspaper layers are dried I put on a layer of plain white paper. It takes less paint to paint over white, rather than newsprint.
Then decorate. I saw somewhere on the internet someone used a scared face on their Lego Minifigure Head Pinata. I thought it was a must. I penciled it on first, then used Sharpie. For the mouth I used a piece of heavy white paper, with Sharpie then glued onto the pinata.
Look at that puffy toddler hand grabbing for the goodies inside. No wonder Lego head is so scared, a labotamy is looming.
What questions do you have? Is this rather clear? It is harder to describe than I thought it would be.