again, as i was asked, i would like to bring some points from this webpage:
http://www.bendov.info/heb/tarot/major/m14.htm
concerning the symbols of this card (the webpage is in hebrew, and you can see there two versions of the marseilles' Temperance - camoin's version and paul marteau's version).
this is the first card i studied to the depth, and i must say that seeing the symbols on the card the way i do (and as ill explain below), the version of the card in the original post of this thread is certainly not one of the better versions - it lacks some aspects.
the symbols as explained in the page:
the temperance unites opposite sides - you can see that in the color of the figure's cloths - the dress is half red and half blue, the chest is blue and the sleeves are red (blue on the inside, red on the outside), and the hair is blue while the flower in the middle of it is red (this time, red on the inside and blue on the outside). that is in marteau's version, and in his version one jar is blue and the other is red. in camoin's version, the jars and the hair are yellow, but in the bottom of the dress you can see two yellow "snakes" marging into each other.
the stream between the jars is double, meaning the liquid isnt just pouring from the higher jar to the lower jar, but its a mutual stream. in both versions (camoin and mareau), there are four streams starting at the right jar, but only two streams get to the left jar - two streams are disappearing in the middle, looking as if they are merging with the angel's cloths. this shows that the temperance is working on its inner self, it purifies itself, and the red sleeves show that the person described is actively and conciously performing this purification.
the temperance works slowly and carefully, not losing one drop, but his work isnt done yet - it has big wings, but they arent spread, and it is connected to the ground with a large basis. this means the process is not complete yet, there is still work to do before spreading your wings and taking off.
while the red sleeves show activity in the pratical field, the blue chest shows repression in the emotional field. it also shows in the cleavage in the upper part of the chest, in the intentionally blurred sexuality of the image, and in the position of the figure - half round, going back into itself. also, the streams from the jars are directed to the center of the card - they are streaming inside and not outside. this might show emotional and sexual repression, a recurring process that isnt going anywhere, etc'.
comparison with other cards of the major arcana:
the 13th card (a.k.a. Death), the one that comes before temperance, shows a sudden change, the temperance works slowly and describes slow processes that take time, investment that would carry results in the long term.
the devil, the following card to the temperance, describes expressing inner passions and feelings, while the temperance is holding them back. the devil shows opposites living next to eachother, while the temperance merges between them. in the devil card, the devil figure has both male and female sexual body parts, shown out and exposed - and on the other hand, the temperance's figure's sexuality is blurred - on first sight it seems like a female (long hair and a dress), but it's chest is flatten, it is heavily dressed, the face are somewhat firm, and the body shape is almost square and not appealing at all (in an opposite to the two nude figures on the sides of the devil).
the most interesting comparison, however, in my opinion, is the one to the Strength and Justice cards (those two cards have a certain connection between them already - as you might have noticed, in the marseilles decks, the strength is number 11 and and the justice is number 8, but the golden dawn switched between them, and in Waite's Raider deck, the strength is number 8 and the the justice is number 11).
the 4 good qualities of christianity are strength, justice, temperance and caution (im not sure im using the correct english terms). 3 of those have major arcana cards in tarot decks, and those cards might have something to do together.
the temperance also shows balance between the mind and emotions and the body and passions. it shows in the fact that one jar is above the figure's waist, and the other is beneath it - and the streams meet in the middle, at the waist.
those three cards might stand for the evolvement in the relations between those two parts - the upper body part (which stands for mind and emotion) and the lower body part (which stand for body and passion).
in the 8th card, the justice, the upper part controls the lower part completely and strictly. in the 11th card, the strength, the upper part still controls the lower part - but the contact is softer than the firm control in the justice, and the upper part doesnt hold the lower part back completely - it lets it express itself (i wont get into interpretating the strength card, but as you can see there, the woman's hand keeps the lion's mouth opened). in the temperance, there is no longer need of control relations and power games - the two parts are expressing themselves equally, streaming into each other and merging to one.
i've seen someone attaching camoin's temperance already, so ill attach here paul marteau's version of the temperance (paul marteau's marseilles deck is the one i work with).