These four images show a range of pigment variability. The whale in the top image is quite unusual with the large expanse of white. Unfortunately the whale never fluked in our presence so we couldn't see how far the white extended. The yellow-orange stains are diatoms (algae).
The second and third image are of the same whale with white on top and also white extending to the sides from the belly. This whale has a dorsal injury from a rope entanglement. Craypot lines are a substantive hazard to whales as they navigate the Western Australian coastline.
The last image seems to owe more to impressionist or abstract art but may just be from old barnacles scars and scratches.
Playing for the All Blacks
These three images are a breach sequence in Exmouth Gulf, Western Australia. Southern hemisphere humpbacks typically have a white belly and underside of pectorals. This 'all black' is more typical of a northern hemisphere humpback. Whilst whales generally stay with their migration group within each hemisphere, crossovers may occur. A field that is ripe for more research.
Dorsals come in all shapes and sizes and thus photographs like these are an invaluable aid to identifying individual whales. This is quite and extreme hook profile. We don't know why these is a metallic sheen line on top of the dorsal.