Link to data source with pictures

I have included headshots in my org chart for our emergency management team.
My boss wants an additional file created that is interactive. I figure I can
use the manual link feature using the external data window, so he can change
the boxes with a simple drag and drop as the need arises. As the information
changes, though, the picture of the original member remains (I simply used
the InsertPicture function for each shape). I tried linking the chart to an
Access database that had pictures attached to the records, but Visio won't
import that column. Can I attach a picture to the external data sheet somehow
that Visio will update as the linked data changes in each shape? Is Visio the
right program for this? Where can I learn more?

Thanks for your help.