I now have the link to Anke Eissmann's
home page. If you haven't explored it before, you'll be astonished over her wonderful artwork!
I can't link directly to the cover picture; you can find it
here by scrolling down to "Daeron and Lúthien (2008)".
Anke's illustrations are featured on a number of covers of books published by Walking Tree. Normally an existing picture was used, but there was none for the theme of music. When we first talked about possibilities, we very soon found ourselves "on the same page" of Middle-earth for the subject. I am delighted over her beautiful painting.
Bêthberry, I find your analysis of the picture very interesting; the two persons depicted are linked only by something invisible - the music!