So I'm going to be showing you guys how to do the cover shown above

~ go to picmonkey.com (they have an app but idk if this works there, also this works on superimpose)

~ press edit and open up your template

~ search up and save the images you want on the cover in a separate tab

~ click the overlay button on the left (butterfly button)

~ click "add your own" and select the first picture

~ position it fully over the top black area

~ a menu will pop up, make sure your on the basic tab. Click blend modes then "add"

~ on the bottom, below the image you are editing there should be a "merge" button, select that when done

~ repeat for the bottom image

~ click the text tab and type in the title and author (I used the fonts: trashhand and la bella aurore)

~ save image