Laurelle
Can you give us some examples of this? I've gone through the Picatrix looking for influences, especially in regard to the astrological decan images (GD used decan correspondences to the Minors) and couldn't find direct associations in the Picatrix. Here's a comparison of several sets of decan images, including those from the Picatrix: http://www.bendykes.com/articles/decans.php
Good article. I think one of the more closer renditions would be the 6 of wands:
Picatrix: A man dressed in filthy garments; and there ascends with him the figure of a lord of the horse looking toward the north; and his figure is like the figure of a bear and the figure of a dog. And this is a face of strength, liberality, and victory....
This would be the man riding the horse, though his garments don't seem dirty and he does seem victorious.
I think the second decan of cancer is more "exact" as it references Myrtle, joy and celebration. You can check the website you referenced. It seems to be written like the copy I have that Steve Ashe translated.