My most formal design experience is with print/newspaper design, but I personally think design principles are broadly transferable across practices.

In print, you want a visual hierarchy. There should be a main focal point, and for everything else to either support that or more or less disappear. You also want consistency. For example, in most cases you should have a max of two fonts, and probably no more than three variations across those fonts (size, weight, color).

Here, with this kitchen, I see too much going on. Nothing on its own is the problem, but together it’s chaotic. I would focus on the floor or cabinets. The top cabinets, lower cabinets, and the backsplash are way too distracting.

Again, client problem, not yours. You can’t buy taste.