If a % is not used, then you could have the images not properly displayed on screen. So yes, use % like I posted. But you'll have to test what % works. You can also use width="50%" as well to do image sizing. But given that you don't have a hi-resolution eInk device, It is highly suggested you either buy one or borrow one (if you can) because what you see on a phone or tablet is not the same as what you see on eInk in terms of images.
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