A picture I did of Actias isabellae (Spanish moon moth) with gouache paint and a ballpoint pen.
They're found in the Pyrenees and small areas of the Alps. As a larva they feed on various types of pine trees.
(http://i531.photobucket.com/albums/dd359/Discoblastula/001-1.jpg)
Normally I would have scanned it, but the picture was too big. Hopefully I'll do some other paintings of saturniid moths in the near future! :)