This is my organised stack with the cover image in the top left position so that it shows as the preview in the gallery view. 

 

This is the simple cover image template that I made in class. 

 

 

This one is the cover image template that I use in my own gallery with a font that I purchased that I absolutely love at the moment. It's called Gelica Semi Bold and I bought it from FontSpring.

 

And this is my Procreate gallery with all of my stacks and cover images.