Hey, I like your cover. The original highlander 2 poster has always been one of my favs.
Just my opinion here but,You might want to clean up the poster art alittle. To make the black more even.I'd use the level and burn tools, just a touch to get the darker aspects of the poster to match the spine/back's black level.
And I love the fact you used the original U.S. title treatment. Cleaned it up a great deal too. Looks good.
I have no problems with you using the thumbnails of my designs. I think that's fine.