On a tablet, the reader can zoom any image. That's one reason I prefer my Fire to my Paperwhite. (I read a lot of military history, and the maps are important.) Otherwise the image will fill the space normally occupied by the text, with due allowance to its height/width. The cover is the only exception, and AFAIK what you want can't be done, at least not for Kindle devices.
If you go to fixed format, your book won't be available for the e-ink Kindles.
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