This is a really beautiful pic ^^
The pose of Amaterasu is great, and I also love how you drew the details in it. Also the shading makes it more vivid and brings a good illusion of reality.
The background is just amaing. The trees look so real, the grass and the stones too. And this water also looks amazing and as it's really running.
It also really looks like the leaves are falling down and that the birds in the BG are really flying.
The mountains in the distance also look great, so blueish, so that it looks really as if they were far away.
All in all this is a wonderful pic, I can really see that you spent time on it, and it was worth it