Here are some images of the construction of a sculpey clay head I have been working on for the past month or two. I decided to finish the project recently and bake the head as I had spent a lot of time on this single project.
I learnt loads, but maybe the most important was not to be too precious, if it don't look right then it usualy isn't right and needs to be changed (trust your instincts!) and also not to go into too much detail too soon. Get the proportions right first, then work on details.
These images in no way convey the amount of time I spent trying to get the eyes right, this difficult task was not made easier by detailng them before they were the correct size and position. Eyes are also usualy recessed further back into the skull than you think.
The model is not perfect but had I continued with it I think it would have driven me insane :-)
Oh, the person I based this model on was the subway ghost from the film Ghost. The actors name was Vincent Schiavelli. I have tried to do him justice...here is the main reference image I used subwayghost reference.