Sequence off for pic loading in emptymovieclip

I have a background picture that is revealed with a mask. Then, I have a picture that loads on top of the background. My problem is that it takes awhile for the background picture to be revealed with the mask. In the meantime, the picture already loads on top of the background… So, the emptymovieclip picture is on the stage BEFORE the mask reveals the background. :puzzled:

How can I make it so that the emptymovieclip picture will ONLY show itself AFTER the mask action is complete?

I’ll attach my files to this post!!

I appreciate your help!!