Just a feeling, that clocks are on the whole not aesthetic objects (I disagree, I think many are), and also that one doesn't want to be reminded of the time when relaxing in the living room. That's also not a problem I have. I often do agree, though, that in certain rooms it is a good idea to replace a clock with a work of art that brings more colour and creativity to the room. In this case I happen really to like that particular clock on that fireplace. But, as you see, I still think you should hang art as well.

PS Sorry about the long delay in replying. I'm in South Africa so I was in bed when you posted.

Interesting bumpouts in brick.... I don't know if it'd work, but have you tried the photo-art adhered in some way, or just propped up on the mantel? Maybe shelf there is deep enough to try...

For a complete turn around look, you can consider going all white. Paint the bricks white for an amazing look. The shelf can be painted white and some black artifacts can look great. Pull the piano to the cent of the wall. Get some art work on the walls and make it a kindaa hobby lobby to display art and music. You can replace the lights on the roof with chandlers of crystals and let them dangle down. Add some greenery to get creative.

A small thing for now - but would your mantel figurines show better on the piano? What do you think about altering appearance of all that brick...

If done digitally - I'd like to see a paint that contrast, highlighting the vertical bump-out parts... as though a frame.... or, another part of the wall... ?

Or place an off-white foam board over the mantel in center, and maybe include the 'inner' angle -- then bring figurines over in front of .. to see what another material would look like above only.