How to change app layout on hero images

hey everyone I’m quite new here so I really need a hand with that.

I saw this app’s hero photo design and I quite love it however I need to replace the design of my own app I already have, but I really want this style ( 3 screens, diagonal, the shadow, etc).

How do I do? Only photoshop or have another way to do it?

thank you a lot

Here is my site Read-Only: LINK
(how to share your site Read-Only link)