In my opinion, a cuckoo clock is a very detailed design, but you say you want a simple design for the room. When you say simple, are you thinking of no wallpaper, no wainscoting, and no accent color on the walls? It seems as if dark orange is a color you favor. I see it in art images and in your curtain color. If this was my space, I would paint all the walls one or two shades lighter than the beige of the sofa to keep the room as bright as possible because the room has no direct sunlight. I would paint the ceiling 1/4 (one part wall color to three parts white). I would use a satin or eggshell paint instead of matte, semi-gloss, or high-gloss paint. I see some discoloration on the wall behind the sofa where the brown color of the sofa frame has worn off onto the wall. I suggest attaching bumper dots or strips on the wood frame of the sofa (similar to the ones used to keep cabinet doors from making a lot noise when they are closed quickly). I would consider painting the sides of the column with the cuckoo clock brown to match the clock. I would do this to call attention to the clock. I would remove the orange curtains and replace them with floor-to-ceiling length draperies hung as close to the ceiling as possible to make the room seem larger and taller. I would change the drapery color to match the walls, perhaps in a muslin-like fabric, which is a casual fabric. I always take my art to a professional framer. I have conservation matting and museum glass used for my art. I would have the three images you have rearranged as a collage in a very large single frame with medium to wide matting between the images. I would have the mat and frame color(s) enhance the images, even if it is a color I might never have thought of on my own. I would hang it above the sofa. I would use the orange drapery fabric to make throw pillows for the sofas. You did not attach a photo of the flooring in the room. A medium tone floor is easier to keep looking clean than a light floor/rug or a very dark floor/rug. Other "Houzzers" will give you completely different ideas. Use the ideas YOU like and enjoy your home!

Photos of the living room would be helpful.

Thanks all, for the suggestion. Yes will stick to white for all other sides of the room. one is full glass with curtains, the other is behind the sofa, a plain wall as of now with no art or anything, this is just opposite to the brick wall. The 4th side is the foyer and a small wall with a artsy clock. The living area is more an open plan, that leads to dining on one side. I am looking for wall art ideas too. I create my own art for the home, I have not gone commercial, just do some art for friends too when they ask as gifts :-). We are changing all the furniture in this room, including the softa. have ordered recliners in light brown color, A square center table with stools underneath, and a side small curio/book shelf. Thanks once again.

I can think of a lot of ways to do this. Like you mentioned, you can put up a family photo collage, or some bright abstract painting which has a ting of red in it, as you have red dining chairs. or you can still retain the mirror which you have there and add two strips of verticle wallpaper to make it more lively.