Need Photoshop Help

[sparelink]

I have 2 pictures of finger prints. I am trying to get a valentines day present together and want to over lap the two pictures to create a heart like this: https://s-media-cache-ak0.pinimg.com/236x/ee/93/14/ee9314280d6e8d2b13b40458ffa3b516.jpg

Can anyone provide me instructions on how to complete this? when i open each picture as layers over covers the other.

 

[Buckster]

Switch the top layer's blending mode to multiply.