Howdy! This certainly is a nice mellow piece. I'm a big fan of Mark Knopfler as I'm sure many are - kind of "Princess Bride" territory, very nice.
Sorry to hear of the guitarists illness and hope things improve for him! I'm new around here, so I didn't get to hear anything in the "years ago" category, but judging by the comments of others, seems like their was much respect and admiration for you both!
OK, I did think that during the first minute of the song, the piano and the guitar seemed to be fighting each other rhythmically, seemed a bit out of sync. It seemed like both were trying to establish the rhythm of the song, but it wasn't the same rhythm. It got better in this regard towards the end, which was more of a true blend and more lined up rhythmically. Perhaps I'm the only one who notices this, but you could look at more editing in the first minute, to bring things in line. ?
Perhaps the answer is, during one part of the song, the piano could be brought forward (louder) as prominent, and then switch - later the guitar could be foreground (with the piano background).
Your piano playing is lovely, which version of Ivory are you using? I have the Ivory D "American Steinway, but I'm not exactly in love with it . . .
Overall, it's a cool combo and a very soothing kind of piece, nice job. Have you tried it without the cello/string line? Just the piano and the guitar?
cheers, and thanks for the share,
-Tom