We're in the same room, same statement console? Already at overkill with ledge stone we can not see? Please do not use screen shots. use Jpegs

No to the Ginkp leaves, that much is certain.

The marble doesn't seem to fit well with the rest of the room. Would you consider using wood instead?

You could do a myriad of things behind the TV. I think I would go with one panel look not the three you have now and yes the black is too dark. I would want one acoustic panel that is the same color has one of the wood tones in the console. At this point I think I would be rethinking the BLACK shelving. I see the other black but w/o the black acoustic panel they might not work.

Your instinct to pause makes sense. With the ledgerstone and patterned console already committed, I’d test the quietest option before adding another texture: if that center field can be plain drywall, try a matte warm off-white or soft putty pulled from the stone rather than more marble or a second slat/panel color. That would give the eye a resting place around the TV and let the console supply the pattern.

If the acoustic panels are needed for sound, ask the supplier whether a lighter, wall-toned finish is available before changing or covering them; I wouldn’t assume an ordinary finish preserves their function. Put two large sample boards next to the installed stone and the actual console, and look at them in daylight and with the room lighting on. A straight-on photo of the installed wall would help separate what’s already fixed from what’s only in the rendering.

IMO ledger stone never should be used indoors and never mixed with marble .You have a nice TV stand and paint that wall behind the TV black and then see if you need much at all on that wall