Definitely the eyes and colors. I notice that on some characters you will draw rounder eyes, which give a more cartoon look to them. Your colors are also vibrant and fun, which is also a characteristic of a cartoon style.
Yeah, you've definitely found an excellent balance. Perhaps I'm a little too American or something, because I generally don't like the anime style. However, there are a select few people who've found their own kind of anime style in some way (usually by mixing in western style) that I actually like more than most western styles.