Has it gotten any better with all the things you added? Sorry, your picture looks like it is hung way too high. Your room looks great. No advice for the echo though.

I have found that rooms that have bare floors echo the most but since you added a rug, I'm not sure what can be done.

Triple lined drapes hung floor to ceiling could help. Can't tell if the chairs have any upholstery on them. You can add lumbar pillows to each of them if they are all wood. An upholstered bench under the window to replace the hard-surfaced one. I don't think canvas has any dampening properties. Perhaps a textile on that wall would help. It can be triple lined like the drapes (even match them) and will help a lot.

Use bigger baseboard and change wall color to more gray . Something like BM oc28

You could put cotton batting behind the canvases if you don't want a tapestry. The art needs to be centered 57-60" above the floor. I don't think bigger baseboards or paint will help with the echo.

I definitely do not see how paint would help. Hanging a tapestry or a quilted wall hanging would definitely help!

Friends had a house with horrible acoustics in it. Among other things, they hung a couple of small oriental carpets on walls - helped a lot.

It has gotten better but it is still there

I'm assuming you hear this sitting down you will also need to add some sound absorbing around waist height to just above the head in a seated position it could be the sound is just bouncing around off the walls. Maybe a tapestry artwork or something closer to absorb some sound. Also the ceiling plans A big role in acoustics as well a completely flat ceiling works less well than one with some texture. You could download an app that measures sound decibel levels and test some things out more scientifically that might help with placement of items too.

Sound waves bounce and reverberate against hard surfaces and are absorbed by soft, cushy ones. All of the advice here about adding more cushiony stuff is very sensible. Chair pads, heavier drapes, and a plusher rug will probably do the trick. Good luck.

Parson chairs or other upholstered seating.

You probably use this room only for dining, right? And when that happens, do you use some kind of table covering? And, of course, there would be people, who also absorb sound waves. Is the echo still noticeable when folks are seated in the room?

Yes it is. When we sit down for dinner it is loud just us talking.

It might be that you need a much bigger rug, the downside to timber floors, are your ceilings high too

Acoustic Panels will help with sound absorption.
Traditional acoustic foam panels can be very effective at reducing sound from reflecting back and forth. Try AcousticArt, a company that allows customers to choose art to embellish normally utilitarian-looking acoustical panels. AcoustiArt marries custom art, text or photography onto materials specifically designed to reduce noise transference and room echoes. A DIY solution is to cut and install foam sheets to place inside the back of canvas mounted artwork; soft foam sheets are often packed while shipping, so you may already have some around. Foam of various sizes can also be ordered online from specialty retailers like Foam By Mail.