Nice start. I would do a color print chair and untie the curtains.

Could we see the rest of the room? Is this the best place for the sofa? It is blocking what seems like the only window in the room.

Something like this?

This rug.

Sanam...keep your questions to one post. I noticed you have another post going w/questions regarding this dining room.

https://emfurn.com/collections/home-chairs/products/alfred-velvet-lounge-chair

https://www.sunbeamvintage.com/product-page/standard-lounge-chair-in-velvet-maroon

https://www.houzz.com/products/medici-tufted-leather-accent-chair-red-prvw-vr~14230644

https://www.houzz.com/products/red-armchairs-and-accent-chairs-prbr1-br~t_527~a_88-1

IMO with such an angular sofa I would look for some chairs that have mor of an organic shape.

Sanam Z, since you are working with an open floor plan, I would suggest to be consistent in your style, so both spaces flow nicely together. Your living room sectional has clean lines and has more of a contemporary/modern feel. And your dining room is more of a transitional style with its warm tones.

My suggestions would be to select a glass dining room table and more of contemporary style dining room chairs. Then, it would be easier to find some accent chairs for your living room. Your furnishings need to complement each other in some ways (finishes, fabric, texture, colors, etc.)

Also, I would suggest to move your sofa, since it is blocking the window.

As far as the art goes, find a piece of art that you absolutely love. Place it above the sofa or on the other wall as a focal point. Then, pull some colors from it to find a nice rug.

Good luck, and I hope you'll post some photos after your space is completed!

http://www.amberhomesanddesign.com