Here he is, now well on the way. I've modelled him around a glass cylindrical vase in order to keep the head hollow. It really does look like Louis, down to the half smile, the hooded eyes and the dimple in the chin.
BUT, a big but, how to remove the vase? It should slide out as I covered it in newspaper before putting on the clay, and have waited until the clay is 'leather hard' before trying to remove it, but … of course the vase is stuck solid. If I keep trying to remove it, I'm in danger of distorting or breaking the head - so, following advice from Jo, my ceramics tutor, I'll make two length way cuts, one behind each ear (bit like a brain surgeon) to separate front from back of the head. Then I'll remove the vase, stuff the inside of the head right up to the top with newspaper to support it, and fit the pieces back together.
There's a special technique to doing this, involving scratching the joins to create a suitable rough surface, applying a creamy clay (called slurry) to the edges to stick together, and then applying clay on top to disguise the joints.