This is what I call reverse tying in order to keep the heads stacked neatly layered instead of them wrapping around the hook. By wrapping towards the back of the hook, you are holding the material in a tight clump the whole time as you tie it down.
This is with the thread on the outside ready for the next layer.
I tie in the tip of the clump of material and then wrap to the back of the hook, instead of forward like normal.
Continue wrapping until you have secured it towards the back, then wrap back to the front in preparation of the next clump. You should try to only have one layer of thread in each direction.
This style makes the head tall and skinny instead of roundish. Once eyes are added it will be round and not a large oval.