God I love that movie. -sobbb- I really like this painting but in some ways I feel its a bit too dark, almost like I can't really see whats going on. Then again it is sunset so there you go But I really like the clouds and the angle you chose. The light coming from behind him is pretty awesome too.
I think that you might want to have added a little more light shining on simba, because he blends in with the background too well. (Unless that was your intention to do so, ofcourse.) The light would've probably added a more dramatic effect too..
Apart from that, great job on all the different colours in the mane. I really liked that!