https://thebeautyrevival.com/blog/fool-proof-method-for-decorating-your-shelves-home-decor-tips/

You have some beautiful things. I like the middle shelf as is. Does the speaker need to be on the top shelf? I think if you moved a few things around you can use what you have. I would leave the middle shelf as it is. I would then move the white objects to the top shelf leaving the white houses in the middle. I would then place the metal globe where the blue bird is now and place the bird to the right of the dog sculpture. I would move the speaker to the bottom left and then stack coffee table books along the bottom.

THis is whay a ihate shelving in most cases . I do see some nice things on yours why do you need any more stuff . For me the shelves would go and a nice big piece of art I love would hang there no need for more STUFF

You are going to get all types of answers. Looks like you have a nice house with nice furnishing, so trust your choices!

Some of us like some stuff on shelving! Most of mine are family "heirlooms", things we bought during travels or when we lived overseas. I have a Moroccan carved brass plate on display .... I saw it being made by a young boy when I was 10 years old during a family trip to Morocco. I have two antique wooden Saints that belonged to my great grandmother, maybe older.

I would pick out which of those items is important to you or you love and you want displayed. Then remove the rest. The shelves don't need to be filled end to end. You have some interesting pieces-you don't need more.