It really is just like butter! Vincent Van Gogh used a brush stroke style called impasto. He laid paint on his canvas so thick that you could clearly see the individual brush strokes. It’s said that because of his heavy layering of paint his subject became more beautiful as it lost its sense of realism.
Most artist, especially newer artists, are reluctant to use a heavy loaded paint brush. The close up view clearly shows Van Gogh’s manipulation of paint. And you have to admit the blending and definition are far less than you expect from a Master. But step back and you see the beauty of the whole.
The point here is; a cloud doesn’t necessarily have to look exactly like a cloud to look as beautiful as a cloud.