Regardless of the height of the ceiling - Artwork should be hung within 6-8" of the sofa or credenza it's hung over.

If you're hanging Gallery-style (One over another) they should still be within a few inches of one another.

Incorporate a ladder so you utilize the height and absorb some of that wonderful space.

I'd buy a set of large, square frames and hang them in a grid pattern reaching higher than normal. Keep the artwork within each one somewhat consistent. All black and white photos, all abstract prints, etc.

I agree, follow the rules for hanging photos and artwork and anchor it by placing it above furniture like a couch or console table. If you are looking to draw the eye upwards and highlight the height of your ceilings try long fabric panels. You also mentioned your living room is narrow so you could put moulding up at standard ceiling height or at 10 feet to give the illusion of a wider space. Hope that helps!

joannieb, we asked our Houzz.com Facebook Fans what advice they could offer and here's what they said:
Houzz Fan Lisa Schuyler suggested you hang your art "At eye view"
Facebook Fan Alynda Ayers said, "you can do several things with a ceiling that high."
She wants to see if you have a photo of the space (and we do too!)