Have fun personalizing your cover !!
Step 1: Find the right picture
Step 2: Pop-art editor
So what you have to accomplish is a simplified photo that consist out of 2, max 3 kinds of color. Great examples we find in pop-art pictures (think Marilyn Monroe or Che). So for the first step in simplifying the photo I used an online photo editor that converts pictures into pop-art. I used FotoFlexer.
Just upload the photo, use the pop-art effect and download it again.
Step 3: Photoshop
After that I removed all the 'noise' in the background because i don't want that to be engraved. (select the background with the lasso tool and just erase it)
Save the picture as a .tiff file, this remembers what you have erased (not necessary, just handy).