From what you gave I'd say this dream is about
changes. Both the painting and the wedding can represent changes.
The green dress to me means healing (for You) the BIG
gold chain (to me) could possibly represent your
ability to heal others.
Go to Traceys website which is linked at the top of this forum page and follow the links to a dream website
which can give you more info on the spiritual meaning in
dreams. I think it's called Asling (?), not sure, so
follow her links and good luck.