I did look for threads to this problem, but could not find any. Problem is als follows:
In Prismic we crop images to a certain format (say 800x600). Great! But when the content is displayed on our page, the image is displayed non-cropped, i.e. in its original side ratio. What went wrong?
This is probably happening because you need to manage the responsive views from the API response in the front-end code. The Image field is going to retrieve a default view and 'thumbnails' We recommend using a picture tag to handle each size of img:
