A tell-tale sign of danger in those vapor behemoths is their shape. In this case the cauliflower-shaped structure tells us this is an actively growing cloud, fueled by mighty forces that propel the air upwards with tremendous forces.
Turbulence, rain, hail and icing are all likely to be encountered here. Good reasons to avoid whenever possible.
Equipped with powerful weather radar, we can get a clear image of the interior of those giants. This enables us to plan routes along or - if needed - attempt a passage through the least precarious spots.
From my perspective as a pilot and photographer, these clouds never get boring. A common show of nature's forces and how insignificant we are in respect to the dimensions and dynamics of weather.
Even from the cockpit of the impressive 747; we are nothing compared to the forces of nature.