Fluid - Change image for a Content Reference that is of the Usage Type = Homepage

It is easy enough to change the image for a Fluid tile using the content reference (CREF) Fluid Attributes tab.  That change shows up just fine on my Fluid home page.  But I have a dashboard that I've also placed on the Fluid home page.  And it simply displays the default image:

Any way to override this at the CREF level ?  Not system wide?

Thanks