The problem with learning how to paint clouds, is that there are so many subtle variables (and sometimes not so subtle!). They can either appear “solid”, or soft. One of my favorite Youtube artists, Tim Gagnon, shows his technique for forming very convincing and multi-dimensional clouds using acrylic paints. An excellent. There are so many ways to paint clouds in acrylics and this blog describes The flow is ideal for the background as I want a smooth, matte, self leveling finish.
Both sky and clouds have some of the softest edges you can find in nature. Like in any part of the painting, in clouds, a balance between soft. This is useful for painting clouds as it means you can create soft edges easily. ( The one thing you can't do painting wet-on-wet than you can do.