A large thumb
The thumb in palmistry is considered the most powerful digit of all because it controls all the other fingers. A large thumb shows strong sexual energy and a domineering nature. A small thumb is a quieter person who finds it hard to speak up in about their sexual needs.

Obama has a long Apollo finger and thumb bringing emotional strength
Jupiter the index finger
When you compare Jupiter with the Apollo ring finger you can see who is in charge in the relationship. If Jupiter finger is longer than the Apollo finger this is someone who likes to take charge in a relationship. There may also be a need for sexual conquests.
If Jupiter finger is shorter than Apollo finger there is a lack of self esteem and self confidence especially if the head and lifelines are joined
Saturn, the middle finger
In the centre of the palm between the rational and subconscious sides of the palm the Saturn finger is all about balance.
A straight Saturn finger is best to bring harmony between will and emotion, as well as a balance between liking to be with people and wanting to be alone.
If Saturn bends towards Jupiter it shows spontaneity and an outgoing nature If Saturn bends towards Apollo it shows a sociable person who also needs their own space If Saturn is strongly bent toward Apollo is a sign of depression
Apollo, the ring finger
An equally sized Apollo and Jupiter finger is lucky and shows good confidence and sense of well being.
A long ring finger shows an outgoing nature and well dressed person An exceptionally long finger shows gambling tendency
A spatulate fingernail shows someone who is really dynamic and on the go
Mercury, the little finger
A long little finger can show good ability to communicate verbally, sexually and emotionally important in relationships.
A straight Mercury finger shows an honest and someone a little naive
With a slight bend of Mercury finger toward Apollo there is more astuteness and diplomacy
A strong bend toward Apollo would indicate some manipulative behaviour in relationships