https://creativemarket.com/UpliftActions/1147476-30-Real-Cloud-Brushes-for-Photoshop

Instantly add your choice of 30 ultra-realistic clouds to your images with 1 click of a Photoshop brush! All brushes are made from photos of actual clouds, so they're as realistic as you can get! Mix and match your brushes and adjust size and opacity to create limitless sky and cloud combinations. Download includes 2 brush sets – 1 for CS6 & CC versions of Photoshop, and 1 for CS5 and earlier versions, as well as Photoshop Elements! An easy and effective way to add instant drama to your landscapes, wedding and portrait photography and more. Also check out our 40 Cloud Letter Brushes for Photoshop