Check these high-quality cloud assets collections by Codrut Bolborojan that can be used in any app or renderer!
Realism is a quite relevant feature of 3D art these days. But creating a realistic look of nature can be torturing sometimes. When it comes to clouds, we do know one guy that can help you to achieve epic realism. If you are interested in creating realistic CG-clouds, you check this huge guide by Codrut Bolborojan that he did recently.
Therefore if you don't have a lot of time to work on the production, you might get interested in his nice collections of high-resolution cloud assets that he has on Gumroad. He's got a variety of collections depending on your needs: three small volume packs, a huge 72 clouds Mega Bundle pack and a medium-size pack. The clouds are in various shapes, so you definitely can find one that will work for you!
Check them here: