Hi Lino,
As rightly mentioned
Now I notice. Product pictures inserted in SE78 aren't clientspecific?
How to copy them?
You can create TR and move them to PRD. or
You may import the picture using the steps as per link
http://help.sap.com/saphelp_nw2004s/helpdata/en/27/1d008bdd4811d3969500a0c930660b/content.htm
Regards,
Deepak Kori