Antoine Lavoisier - Father of modern chemistry

This chap is by all accounts the father of modern chemistry.  He also had the misfortune of being on the wrong side of the French Revolution and was sent to the guillotine!  I did wonder whether he was thinking about science or his fate whilst doing this.

The sketch was live at the Scottish National Gallery and the watercolour when I had a bit more time.

Later edit - just learned a bit more about Lavoisier.  He's credited as being the one to correctly identify oxygen as an element and end the given wisdom that since Greek times maintained that the universe contained 4 elements - Earth, Water, Fire and Air.