What is depicted in the top left illustration on the front cover of the Penguin edition of the Earthsea quartet, see for example here?
Presumably it is something from "A Wizard of Earthsea", as the other three illustrations are easy to identify and are from the next three books. But it appears to show Ged as an adult, and on land rather than at sea. That for example would rule out his conflict with Yevaud, in which it is clearly stated that he insisted on confronting the dragon over the water. Could it be the first appearance of Ged's shadow on Roke Knoll? - I don't think so as my impression is that it should have been a much smaller being, and moreover I don't think Ged would have had a mage's staff at that stage.
A larger version can be seen here from the 1991 Roc Books edition: