Peter Ferguson has an immense collection of covers that he has illustrated on behalf of some of the top publishers in the world. We have just now compiled a huge gallery of them and they are available to view here: http://www.threeinabox.com/peter-ferguson-covers-and-posters
Although Peter works in oils, you would be quite surprised at how fast he can move from his sketches to his final artwork. Considering the serious level of technical skill that Peter employs, particularly with his rendering of the human form and his control of lighting, his work at such a pace strikes us as nothing short of genius.
He has illustrated dragons playing cards, children careening across rooftops, genies bursting from bottles, and such a variety of scenario that it boggles the mind.
Peter’s own folio site is available here: http://www.uberpete.jitterjames.com/