create a clearly evening blue hour sky slightly darker and calmer with deep cool blue as the dominant colour keep the clouds mostly soft blue grey and natural add only a very subtle trace of dusty pink and muted rose from the last residual light after sunset visible mainly as faint horizontal streaks and delicate colour transitions in a few selected cloud areas the pink should be barely noticeable low saturation and softly blended into the blue never becoming a dominant colour keep the overall atmosphere elegant quiet and photographic with realistic layered clouds soft edges and plenty of deep blue evening sky the result must clearly read as evening after sunset with only a restrained hint of pink afterglow avoid bright pink clouds strong mauve orange peach golden tones or any sunset like effect
