Wateris the element of change. The moon is the source of power in waterbending, and the original waterbenders learned to bend by observing how the moon pushed and pulled the tides. The Water Tribes are the only people who did not learn bending from an animal.
Sketch of Valar during Valian Years (before the Lamps)
Namo,Yavanna,Aule,Melkor,Manwe,Varda,Ulmo and Orome
No Irmo and Nienna because they look a lot like Namo, and no Nessa because she looks a lot like Orome. No other girls,because I don’t care for them actually. And no Tulkas - because I can’t imagine his appearance before the Years of the Lamps.
It was a bad idea to draw Aule and Melkor together,because generally they made from one material,both of them are giant rocks. So Melkor is a rock + ice + fire, and Aule is rock + lead,gold,manganese and other kinds of ore.
I love the idea that the valar have different forms that reflect their own dominions. Sometimes it can be a little hard to keep things straight with all the names in Tolkien’s universe, but the visuals definitely help.