This relief can be found on the side of a monument to John Everett Millais outside of Tate Britain in London. The sculpture was originally erected infront of the museum because of his help in founding the Tate Gallery but was moved in the mid 1900s to the rear of the building.
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 firstname.lastname@example.org to find out how you can help.
The model had to be rotated 180 degrees to print and requires suppports. You might want to scale it up for better detail.