I'm afraid there is no way to access the "available space in the page" with CSS, at least not with the subset of CSS supported by ePUB. Even the "full height of a page" is problematic.
You'd have to settle with some default size and, if you absolutely do not want the image to be in its own page, you could add "page-break-before: avoid;", but that could lead to a lot of blank space in the previous page.
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