Fire is the element of power. The people of the Fire Nation have desire and will, and the energy and drive to achieve what they want.
Earth is the element of substance. The people of the Earth Kingdom are diverse and strong. They are persistent and enduring.
Air is the element of freedom. The Air Nomads detached themselves from worldly concerns, and they found peace and freedom. And they apparently had pretty good senses of humor!
Water is the element of change. The people of the Water Tribes are capable of adapting to many things. They have a sense of community and love that holds them together through anything.
It is important to draw wisdom from different places. If you take it from only one place it becomes rigid and stale. Understanding others, the other elements, the other nations, will help you become whole. It is the combination of the four elements in one person that makes the Avatar so powerful. But it can make you more powerful, too.

Ever since I lost my son…I think of you as my own.
Because I am having so many Zuko feels since his older version was released. I can’t even. I just. Just can’t *_*
So I had to draw some Iroh-Zuko, since it’s one of my all time favourite relationships ever. And I know, Iroh is so so so proud<3
And I kind of have this headcanon in which Zuko and Iroh haven’t seen each other in a while, considering Zuko is busy with his Fire Lord duties, and Iroh is far away in the Earth Kingdom..I bet Zuko came for some calming jasmine tea.<3