querying against two foreign keys

In my database there are tables for ArtworkImage, Artwork, and Artist.
Every ArtworkImage belongs to an Artwork, and every Artwork belongs to
an Artist.

class Artist(models.Model):
directory = models.CharField(max_length=128) # this is a lowercase
version of the artist's name
...

class Artwork(models.Model):
artist = models.ForeignKey(Artist)
...

class ArtworkImage(models.Model):
artwork = models.ForeignKey(Artwork)

I spent yesterday trying unsuccessfully to write a query that would
return a set of ArtworkImages associated with a particular
Artist.directory. The docs about reverse foreign-key lookups seem to
indicate that this is possible:

artist = Artist.objects.get(directory='smith')
artst_image = artist.artworkimage_set.all()[0] # I just want one

I've clearly misunderstood something because this throws

> 'Artist' object has no attribute 'artworkimage_set'

Thanks for the help.

Franklin
--
Art, writing, journal: http://einspruch.com
Comics: http://themoonfellonme.com

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