I canโt fathom charging someone for a build and not having them approve a physical sample of the wood/finish combo.
Hell when I make something for my wife I show her a sample of the finish on an off cut from the project before I commit to anything.
Also, it looks like the floating panels of the doors are birch and not oak. And Iโm not 100% convinced the rest of it is oak. The splotchiness and what looks like grain reversal in some places. Maybe pine, maybe poplar. Iโd love to see the end grain of the drawers.
At the very least the still visible milling marks and inconsistent sanding are the wrong choice for the stain used. The rustic milling isnโt necessarily bad in and of itself if you like that look, but it needs to have a better dye/stain combo to avoid the harsh splotchiness. But more specifically, itโs not remotely close to the refined (actually planed smooth and sanded properly) look in the inspiration piece.
Did you or the builder specify actually using walnut? IMO there isnโt a better looking wood than walnut with a thin oil finish (what is pictured in your sample).
All that said, what you got wouldnโt look terrible in a rustic house, but itโs a far cry from the level of finish in the inspiration.