Picture with more than one mask

Hi all,

I`m sure this has been discussed before and there must be a simple solution. I have a picture and on top of that I would like to have another picture appear with a special mask sequence (fairly easy… 6 parts of the pictures should appear in consecutive order). whats the best way to get at this?

A) rip the picture apart and fade the single parts in?
C)have a several masks and fade them in?

thanks for the feedback,