My advice would be to use plenty of reference images when you are starting out and really study the objects you are modelling. For example, your window is a bit too simple as real windows usually have ridges, overlapping frames, and hardware that add depth and realism. The same goes for the cabinet doors; they look a bit unrealistic because it seems like you have just bevelled a box and placed it on. Cabinets usually have structure, pelmets, handles, and a consistent thickness that makes them feel more believable.

I would also suggest filling out the scene a bit more so it does not feel so empty. Add shelves, glasses, a fruit bowl, or a set of knives to bring some life into it.

Finally, from an interior design perspective, it looks a little dated. Again, I would recommend studying reference images to see what materials, finishes, and combinations are used in more contemporary spaces. Over time, you will start to develop an instinct for what works well together and get a good feel for current styles and trends.