When adding photos to a Pushpage region, double-click the image to make sure the image is the intended size.

You can use the Orig and Fit tools to size the image so it displays as you wish: 
  • If you select Orig, the original size of the uploaded image displays. Select this option if you upload a photo in the size you want it to display
  • If you select Fit, the image sizes to fit the region. Select this option if you upload a photo that is too large for the region.
User-added image

Note: Images may appear distorted when viewing Pushpage Issues through the Gmail Mobile App. We are unable to make adjustments to prevent this, and the following link has more information about this:
https://litmus.com/community/discussions/43-gmail-app-images-not-resizing