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From a spec perspective - to tell you where epubcheck is coming from:
The spine describe the 'play' order of the document and is the list of top level "item"s in the epub in order that they should appear. You cannot link to items that are not in the spine (because then you would be outside the playorder, and next and previous etc... would have no meaning).
Furthermore the only legal spine items are html or svg documents (- there is some wiggle here, and most readers will actually support image files - but it still isn't legal).
In the here and now however - if the image in question is the background image for the html you are working on, then you will need to rely on the reader to provide zoom in actions for you.
If the image in question is composited upon the background, then you should create an additional html page where the larger image (Image05.jpg in this case) is the background of another html wrapper page, and place that html in the spine.
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