Even your doodles has a strong epic feeling to it. The style... I come to think about 'Whinny the Phoo' from the first very books/stories. The Author back then, has a style there reminds very much like this one... I think. ^^
It's hard to describe why I like it so much. I do like the proportion choices of all the characters. And the simplistic use of line and color. Reminds me of Chinese paintings. All I know is that when I see your pieces I have deep feelings about them. In my chest. The turtles have been with my since I was small. So, in a silly way they are family to me. Remind me of good things and my sibling who I used to watch it with. As an adult I appreciate the way you give them a very mature, pensive perspective. Even in action the characters have rooted emotion.