I am skeptical that you can (or want to) fill the page, given that e-book readers come in various dimensions. The Fire tablet, for example, is skinnier than most e-ink computer screens.
I also usually put an image in its own file. I don't use SVG except for the cover, which Sigil does for me. I put an inline width instruction (usually 100%, with exceptions for the book colophon and for images of poor quality) but nothing for the height. This is the style:
div.image {
text-align:center;
margin-bottom: 0.25em;
}
The bottom margin is to provide a bit of separation if there's a caption, as there usually is.
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