John Clare: Portraits
This is the front cover of the John Clare Society Journal, which features a photo by Peter Moyse, A.R.P.S, of Henry Behnes' bust of Clare made in 1828 and now in the Northampton Central Library.
The engraving below by Edward Scriven (1821) was taken from William Hilton's portrait of 1820, both of which are online at The National Portrait Gallery: William Hilton

The only known photo of Clare, 1860s:

There is also a portrait by by William Henry Hunt, which might be of the poet at The National Portrait Gallery: William Henry Hunt
Cartoon by David Levine, New York Review of Books, December 19, 1996: David Levine's Cartoon
Simon Kövesi
17.10.07