This is the most common mistake, and often the hardest to correct once made. An oversized sofa overwhelms a room; a too-small table loses all its impact in a large space. Proportions are not a matter of taste — they follow precise rules that the best decorators integrate from the outset.

In a premium interior, each piece of furniture needs space to breathe. You should allow a minimum of 80 cm of circulation space around main furniture pieces, and ensure that no single element visually dominates others disproportionately.

A refined interior can very well blend wood, metal, marble, and fabric — provided these materials interact harmoniously. The mistake isn't in diversity, it's in the lack of coherence. When each piece tells a different story, the space loses its soul.

The key is to choose one dominant material that structures the whole, and two secondary materials that complement it. Warm wood can thus be combined with brushed brass and natural linen to create a palette that is both noble and coherent.

• Wood + brass + linen — organic warmth and subtle refinement
• Marble + steel + velvet — cool elegance tempered by textile material
• Rattan + cotton + ceramic — natural, airy, contemporary

Lighting is often the last decision made during a renovation — when it should be one of the first. A beautifully furnished room can lose all its impact under lighting that is too cold, too direct, or too uniform.

In a premium interior, multiple light sources are always layered: general ambient light, accent lighting to highlight certain elements, and decorative lighting that creates texture and depth in the evening. This layered approach is what gives photographed interiors their distinctive warmth.

Emptiness is not an enemy — it's a tool. In the most refined interiors, negative space is as carefully considered as the furniture itself. The temptation to fill every surface, every corner, every shelf is understandable, but it invariably ends up drowning out the pieces that deserve to be seen.

A single decorative object placed on a console has infinitely more impact than five objects piled together. This is the principle of minimalist staging: the fewer elements there are, the more each one shines.

A premium interior is experienced in motion — one moves from one room to another, and this transition must be fluid. A common mistake is to treat each room as an independent project, with its own palette, its own style, its own rules. The result is a home without identity, where each space seems to belong to a different universe.

Consistency does not mean uniformity. It means there is an aesthetic common thread — a recurring color, a common material, a shared style — that runs throughout the home and gives it its unique character.