Thick fluffy clouds getting bigger, they are expanding into the atmosphere like a huge balloons changing their color from white to yellow, and grey

cumulus cloudscape clouds cloud sky cloudy air weather climate vapor stratosphere heavens atmosphere blue sky background day skyline fluffy altitude floating blue fog white daytime space free flowing natural cotton like nobody heaven beautiful nature tranquility serenity light view no people spook daylight beauty sunlight bright summer freshness vibrant scenic outdoor outdoors sunny