Known as Gramota No. 200, Onfim's self-portrait includes his Cyrillic alphabet exercises above a drawing of a horse, a sword-like weapon, a defeated enemy and, next to a depiction of himself, his ...

The distinctive sketch was stumbled upon by an antiques enthusiast A rare pen and ink sketch by a leading 18th-century British portrait artist has been discovered by chance in a wheelie bin in the US.