Since the advent of the larger Fire tablets, I have taken to uploading images that are 800 pixels wide. I generally use the html instruction width="100%" because I have seen people peering at their screens, trying to suss out the detail in a postage-stamp-sized photo, not knowing they could zoom it with a couple taps. It works in all the devices/apps I have tried, and it doesn't do any harm in the very old Kindles, which zoom by default. Works in the Nook, ADE, and Kobo desktop app. I don't delve any deeper than that, but I've never had a complaint.
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