Hump/Slump moulds

We've had a few boot camp sessions in the plaster room making hump and slump moulds.  I used plastic wrap in my first hump mould (not trusting that the plaster would come out) and consequently had folds in the plaster which had to be filled with clay before making the corresponding slump mould in plaster.  Live and learn, as they say.

I had the idea that this shape would make shoulders for my portrait busts.  I could combine mould work (shoulders) with slip-casting (neck) and hand-building (head).