Most of his works are known to at least one of "us cousins", so when we see his sketches, designs and life drawings we usually have a good idea what it was all about. I will start with one which is a mystery. One of his best works, The Pardoner’s Prologue, would seem to be a good candidate for this sketch on paper but there is no evidence and some family disagreement about it.
Bridgman have a better picture of The Pardoners Prologue. The detail in this painting is extraordinary. Helen Cooper's article on this work will I hope be available on line when permission is granted.
Bridgman entry is here;