Through the years Mona has been speculated over, stolen, recovered, splashed with acid, warped, cracked, stoned, mugged, passed around, spoofed, and always adored. Needless to say, she has quite a backstory. This is what makes her so special and an irresistable stop in the Louvre. She is not a larger than life painting like some in the same museum. She could easily be hung on the walls of the average home.
She can teach every writer a good lesson. Your characters don't need to be larger than life. They don't need to be perfect. They take time to develop. They need a good backstory and some mystery. When properly developed your characters will not only be irresistable and adored, but they will also be spoofed and hated by some. Most importantly, they will be real to the readers.
Do you have a Mona Lisa characters?