White walls always evoke a luxurious look. Playing with colors is much easier when placing furniture inside white walls. Also, when you say white wall, you don't have to choose the whitest color directly. Warm whites may suit your home where you want a warm environment. For example, Benjamin Moore's White Dove color can be a good choice.
The next suggestion to make the house look more luxurious may be related to the items. There is a rule of three in design. You can apply this rule to accessories, items and anything you buy to decorate the house. You can follow this rule by combining objects of three different sizes.
Finally, leaning the furniture against the wall is not that luxurious. A little distance from the walls will make your home look more beautiful and luxurious, as separate furniture will create their own areas.