These are two ways to create screens of the above type.
1) Use online tools - Find an online layout tool on google and add an image or web URL to it, it will create a layout for you.
2) Using Photoshop - Download the mockup psd file and open it in Photoshop, add screenshots on another layer to it.
Note. The online tool generates images like the ones above, but the layout quality is not goog = d, so I recommend using the Photoshop option.
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