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As has been said the choice is yours and depends on your audience.
If it is for tablets with big screens, the pictures can be bigger, otherwise 600x800. What you do want to avoid is stretching pictures out to fill the screen. The pictures will be blurry and unpleasant to look at. If they are smaller than the screen, leave them that way unless you have access to larger originals that you can resize to come closer to filling the screen.
If the pictures are smaller than screen width, you might want to give consideration to centering them. If they are maps or other image like your 560x190, you might give consideration to which way you want them displayed; shrink to fit the width or have your reader turn the machine sideways to get a full view. Again a judgement call.
If you have access to someone whose judgement you trust in your prospective audience, they might be a good source on these judgement calls. Academic users have entirely different imperatives than casual readers, for instance.
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