This bust is a study for one of the figures on Bacon's monument to Thomas Guy in Guy's Hospital Chapel, London. Unlike Thomas Banks, Bacon was not greatly interested in looking to classical prototypes. 

The tortured expression of Sickness is more naturalistic than the Neo-classical ideal of noble simplicity would allow. John Bacon, Sickness, marble, 1778 

This object is part of "Scan The World". Scan the World is a non-profit initiative introduced by MyMiniFactory, through which we are creating a digital archive of fully 3D printable sculptures, artworks and landmarks from across the globe for the public to access for free. Scan the World is an open source, community effort, if you have interesting items around you and would like to contribute, email stw@myminifactory.com to find out how you can help.