It took a while to do that one, but I finally finished it. The Fox card represents cunning, cleverness, and trickery, but also discretion, vigilance and survival.
NOTE: Unlike the Snake card, the Fox isn't always a bad guy. He does what he must to survive and/or provide. The Fox can be quite charming while he dispossesses you, whereas the Snake is downright mean and dangerous, and will strike without warning nor pity.