jennifer, if you want to do a slat wood wall (there are a lot of tutorials on how to do it. it's mainly 1x1 or 1x2 wood 'sticks' that are 8'-10' tall. you could use fir and stain them. or you could paint them black. or, if you have a bigger budget, get walnut or something similar. walnut you'd only have to oil. it's a red wood. just a medium brown tone that would great w/the floors. if you like a more natural color, look at 1x2 white oak pieces. (any lumber place should have them) a satin oil finish is all you would need. those can also be stained a walnut color. (oak is cheaper than natural walnut this one is actually poplar that they painted. if you're goign to paint, use poplar wood https://brepurposed.porch.com/2020/01/20/diy-wood-slat-walls/ so, you'd paint the wall black, and attatch the slats. this looks like Alder that has been stained a darker walnut stain. here's the lighter stain color. you could also get plywood and rip it to 1" pieces (however, plywood and lumber have skyrocketed this last year. it's ridiculous what a sheet of plywood costs.) https://simplyalignedhome.com/affordable-slat-wall/ I think if you even did the entry niche w/some type of slat or design would look great I'd go all the way down, and prop paint it black, or do the wall in black and do walnut wood pieces. or, I like this too. find a cool black/white/gray piece of art, something more vertical, and hang it. bring in some bright color stools to fit under the marble. bring in a entry way rug that matches or make a cool design and use that as your art element in the niche (I actually made a headboard similar to this one out of scrap wood pieces. came out really cool) over on the dining wall, you could easily do a living plant wall

I think a couch that has less depth would work wonders in this space. You have a very narrow field to work with, albeit still doable. It might help to mount the TV, otherwise get a thinner console. Sectionals are usually unnecessary but if you plan to keep something similar, a sectional like this would work well. It has less bulk than your current couch and the sleek lines help to divide the room from the entrance.

Came here from your other post about window treatments. I can see why they used the dining room for the LR. That light is wonderful! If you use your dining room less than the LR, I'd swap them too, Then the stage makes more sense, "Ta da! Dinner is served." Really tho, it's not that bad. If the entry hall were wood like the rest of the house, it probably wouldn't stand out so much. Maybe. 😊

Great space with so much potential! Suggest searching modern on line rooms and any specific items you are considering. Save everything you like, as a plan will make it easier (for both short and long term additions) and take your time. Some ideas: Wall next to stairs - keep it simple; off set opening with height/volume and leave wall empty. Large vertical art on left of windows (will draw the eye away from toys as well) and on right, add a floor lamp and chair (as per Beverly’s suggestion). Fill the gap on left of fireplace, creating a more impactful feature wall. Ideas: large art (and you can mix metals). Shelving Could paint black as well. Accessorize below TV Save/keep coffee table ideas, so you are ready when the time comes.