I believe you will need to use a custom layout built using an XML stylesheet editor... : http://www.oracle.com/technetwork/developer-tools/apex/learnmore/custom-pdf-reports-1953918.pdf
Thanks for the answer and my apologies for the delay.
Yes, this is probably the document I need.
I will read it first.
Indeed, I would need a custom layout.
Unfortunately, it seems (according to this white paper) not possible with the APEX listener only. I would need a third pary tool. A pity...
For me strange, that I cannot generate such a report having images or pictures in a pre-definied report layout... Maybe a future enahancement for Oracle.