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Mixed text and graphics are always problematical. They nearly require significant help from a stylesheet to display sensibly. If you cannot get the rtf file into a HTML format that displays well, then I think it is unlikely that Calibre will be able to a good conversion to epub or mobi (as under the covers these are both html based formats).
That is not a lot of help I am afraid, other than pointing out that concentrating on getting good HTML is likely to be the best way forward.
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