One Jack is clean shaven while the others are not, and so on, there's no end to what significance you can put upon it, this does offer some good patter possibilities during a routine but that doesn't mean the original designer of the earliest pack of cards had any special intentions in mind other than making them look interesting and attractive. The King of Hearts is often called the 'suicide King' because he is supposedly stabbing himself through the head with his sword, but you could equally say he was raising his sword in anger to strike another. Also how you lay the cards out may be considered relevant, thus the two one-eyed Jacks can be laid so they look directly at each other or away from each other and according to the whim of the diviner you can read different interpretations into these juxtapositions (friendship versus animosity for example). For example if a court card is facing one way you can say it is looking to the past, if it looks in the opposite way it looks to the future etc.

Those who like to use cards for fortune telling come up with all sorts of invented ideas as to what it all means, but mostly it's hokum. Does there have to be a reason? It's just the way the tradition has developed.

Poker cards king of spades