The meaning of eye color, as interpreted on this reproduction French postcard, is mixed with symbols of luck and love including fish, a shoe, the number 13 (albeit bad luck in this case!0, a little pig, a single die, and anchor, and more!
We surely can't guarantee this to be accurate, but we can enjoy the fun of it.
The translation:
The style of the art is old-fashioned, and the postcard itself is quite a lot of fun!