@Tim Ellis: Thank you mate

indeed, some postprod is done : composing the clouds photo, the rest is mostly straight out of maxwell... if there is some glare, it is the maxwell one. In some interiors there is some noise reduction too.
@Acquiesse : thank you! the white wall are mostly a 2layers bsdf, 1 at 85weight is lambertian (214.214.214) the other have a almost white roughness map & roughness set to 85. hope it helps!
cheers,
Raph