While taking pictures of a sunset, people often focus on the setting sun. Even though this does make sense, it’s usually also very worthwhile to turn around and look in the other direction, away from the sun.
Photographing towards the sun is often tricky. The contrasts are large, which makes a proper exposure hard to get. Facing the other direction gives you far more subtle colours. The lower part might already be in the Earth’s shade, while the higher clouds are still sunlit. But that light is filtered through the atmosphere, giving it often a warm look.
During our crossing of the Atlantic Ocean, we had several beautiful sunsets, this being one of the most spectacular.