I've always loved clouds because each one is so different. I look at them, look away, and somehow they have changed although I can't see them change if I stare at them continuously. Mysterious. Clouds are full of the range of values from dark to light. I think if I can master painting them, I will have mastered the importance of getting all of the values into one painting.
It's too hard to paint at the beach since the wind is so strong but I am taking lots of photos and hope to work on this when I get back to my studio.
And yes, this is a thunder cloud!