Hi Amyel,
It does seem as though you have the mystic cross in the centre of your palm, and as Alissa reported, this indicates a keen interest in mysticism. It marks an ability to think intuitively, and where one has a gut feeling , usually always correct. From what I can gather, it is in the position indicating a serious attitude regarding psychic interests and matters, also in religious or occult studies or subjects.
A small faint cross attached to the headline, or just below it can indicate some anger that is hanging around. usually it is to do with issues of support, perhaps there was a period of your life where you felt unsupported or betrayed, and as a result, you have some anger hanging around still. Also there could be some injury to the head, or a period of great mental strain if the cross touches the headline.
The cross, where the teachers square was once, can sometimes mean intrinsic happiness within a relationship. Great and fullfilling happiness. I agree with Alissa, the teachers square can fade if teaching is no longer a growing concern. The cross under the index finger can also mean strong leadership abilities, power and assertion, though it would be more indicative if it were a star, but perhaps there could be very very faint lines crossing through the cross on one of your hands. Strong ambition is also indicated here. This does depend on your index finger and it's overall structure.
The star on the fleshy mount at the top of thumb mound, (this is your mount of mars) indicates courage, if a star is found it shows exceptional courage, if a cross, then this is the start of the star to come.It can show a willingness to accept consequences of ones actions, also to get up again when knocked down. If the mount is very red though, it can show anger and even beligerence, and rage in some cases. This could again be anger from the past, not dealt with yet.
the cross on the fleshy pad below the ring finger, as Alissa said, is a sign of creative ability , on a large scale if it is a star. A very individual person, with exceptional creative ability.A very good imagination is shown here. Good fortune was indicated in the old palmistry books. The down side of this, is if the gift of this cross or star is not being used. It can lead to apathy and a feeling of low self esteem. Like everybody is against you, and puts you down, even though it isn't true.
The fact that all these markings are on the dominant hand would tell us that these markings are a part of your public side, the part of you that you have shown publicly or are developing now. Lines do change. If they are also on your passive (or private) hand, the meanings are much more certain, usually means they are inherent or inborn traits.
Amyel, if I think of any other explanations, I will write again. The large spaces between fingers is a sign of a free spirit,and quite an open individual. A person who thinks and acts very independently, can be daring too.. Also, perhaps not too concerned with money, perhaps money falls through your fingers. A square gap between the index finger and the middle finger will reveal a high achieving businessperson, perhaps a lawyer.
Hope this helps, please let us know if you need any more info.
Regards Dark Eyes.