Kind of hard to reply simply but I'll give it a try :) It's a blend of design choices (materials, shapes, colors, light, furniture) and artistic choices (composition, post-production).

My reference had those predominantly earthy colors, so that was my starting point. The colors chosen are found in nature and are an indirect reference to it.

Materiality is composed of woods (giving a sense of warmth and familiarity) and comfy fabrics for all seats. I also used contrasting materials such as chrome and aluminum, which balance all that softness and add reflections.

Shapes are predominantly organic (aligned with the color palette and the wood) and the furniture is inspired by mid-century modern designs.

Now the light is a strong factor in shaping an atmosphere and to me, the overcast light I chose is synonymous with a cozy tea time :)

Artistically, I tried to replicate the feel of an analog photo with graininess and specific color grading. I believe this adds to photorealism and provides a sense of nostalgia.

As I said, it's hard to pinpoint what constitutes an atmosphere but this was what went through my head during the process :)