need help with admin list images

in my model i have an image field as such:

Thumbnail= models.ImageField(upload_to="images/partners/
thumbs/", blank=False)

I want the thumbnail to show in my admin list. My admin class looks
like this below:

class PartnerAdmin(admin.ModelAdmin):
list_display = ('xx','AdminTag',)
search_fields = ['AdminTag','Title','Description']

def xx(self):
return '<img src="/static/sitename/%s" width="65"/>' %
(self.Thumbnail)
xx.allow_tags=True

The result:

Caught TypeError while rendering: xx() takes exactly 1 argument (2
given)

What am i doing wrong here?

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