Hi,
Yes, as druid says, this is not possible. I have recently overhauled the RTF/DOC export to support certain rich text elements, but images are still not available. The trouble is that to support headers and footers at all is an enormous hack, as I have to hack into Apple’s default exporters which don’t support such features at all. Adding images would be an enormous task, and should definitely be left to a dedicated word processor - Scrivener was never intended to replace a word processor altogether for more specialist documents. It can pretty much replace a word processor for novel-writing or short-story writing, but most other formats will require some tweaking in a specialist tool at the end of the process.
Thanks and all the best,
Keith