1. By default the focal point of each image is centered, you can see how the desktop ones looks below, by pressing "Responsive" you can also choose to view it in mobile size as well: 
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2. By default mobile has the same focal point as desktop (centered): 

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3. This can be changed if you press on the uploaded image and navigate to the "Focal point" on the top left side: 

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4. You will be able to move the little white dot on the control panel on the left and the view marked in red (on the right side) represents how it will look on mobile: 

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5. Just by changing focal point you can use the same image, but still chose which part of it to show on mobile : 

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For more Content related questions, you can check our Statamic help articles.