Place small but long tufts of fiber over the outside of your frame and felt from all angles to maximize strength and compactness. Work from the inside-out or use a reverse needle if the felt begins to sag.
Keep adding felt until the body is completely opaque. Coarse needles move a lot of fiber but tend to leave the surface ragged; you can smooth everything out nicely with a smaller gauge needle.
Here is what we are aiming for... let's work on the feet next!