Unfortunately glass will have to go. Notwithstanding the suggestion to add SR products these will only tame but not remove the effects of the highly acoustically reflective pictures (I have a full SR ART and HFT setup originally installed in my SoCa all glass modern house which you can see in my old system description)
I experienced just this in my new room gradually eliminating each piece of artwork and hearing the improvement at each step. I still have a window but that is itself heavily treated. There's no comparison in how good the two rooms sound
luckily manufacturers of acoustic treatments have realized that not all of us want to look at plain cloth so are now making acoustic panels that double as art, for example ArtPanels from GIK acoustics are well priced and attractive.
I experienced just this in my new room gradually eliminating each piece of artwork and hearing the improvement at each step. I still have a window but that is itself heavily treated. There's no comparison in how good the two rooms sound
luckily manufacturers of acoustic treatments have realized that not all of us want to look at plain cloth so are now making acoustic panels that double as art, for example ArtPanels from GIK acoustics are well priced and attractive.