What would be wonderful is a portrait in the style of the period, maybe something Sophie commissioned and made him sit still for *g* Though I suppose a portrait like that would typically be full length, and I'm most interested in his face
There is a portrait in canon! I have a recollection of it being in the drawing room at Ashgrove, with Jack wearing his order of the bath and grenades of some kind exploding behind him. But I'm also pretty sure that was full length. Either that or I'm mixing it up with the self-portrait of the non-flying pilot with the drinki problem from the Airplane movie...!