I am going to rapid-fire off everything I see, so forgive me if this comes across as terse.
There should be a slight separation between the sink and the counter- double the width of the crack, I’d say (or if it’s a cheap house, 4x)
Your water looks… gelatinous, I’m not sure why it has waves but I think it would look a lot better without them (or with much smaller waves)
Your wood countertops, as they currently exist, would be a disaster. Real wood countertops like this would have a clear lacquer waterproof clear coating. You should add clearcoat into the shader, or even add a plane with a tiny amount of thickness and give it a clear lacquer or shellac finish.
On that note, the displacement on the wood is too strong- grain worn that deep would take at least 50 years of heavy usage. Your wood looks more like the floor you’d see in a 70-year-old house than a countertop. Turn that displacement way down.
Your tile looks really good, no suggestions there
The window sill should have dust on it (no one dusts window sills frequently, and they collect dust very quickly)
What is the blue, carpet-looking thing on the front of the cabinets? Is that a dishwasher? It doesn’t look at all like a dishwasher if so, it should be plastic or metal. A different metal than your brass, it’s unlikely that someone would have perfectly matching cabinet knobs, sink hardware, and coffee pot. I’d say the dishwasher should either be chrome or off-white plastic.
Why is there no soap in the soap dish? At the very least, there should be soap crumbles or residue.
The sink needs visible edges- that is to say, currently it looks like it was cut out of one solid piece of marble, which is possible, but highly unlikely. It’s far more likely that it would be glued together from flat slabs of marble, so there should be beveled cuts on each corner. Like this:
And those cuts should be reflected in the texturing.
The cloth jumps out as wrongly scaled- I think the cloth weave texture you’re using is too big, scale that down quite a bit. At the same time, you need a stronger weave- scale your displacement up, but the overall texture down- if that make sense.
Why are there slats of wood in front of the sink, but the rest of the wood is smoothly cut? It feels disjointed- I think that would look better as a smooth piece of wood.
With all that said, you’ve done incredible work already! I would absolutely accept this as a Finished Project if you labeled it that Your brass material looks great, and you did a nice job with the window and blending in the background.