What do the pictures on the cover of The Twilight Saga mean?

Taken from the book: The two Chess pieced on the cover of Breaking Dawn both represent Bella. They show her moving from the least significant player, the pawn, at the beginning of the Saga to the most important player, the queen, at the end of the series. The chessboard also hints at Breaking Dawn's resolution, where the battle with the Volturi is one of wits and strategy, not physical violence.