Good capture. Looks manacing. You must have been luck to get him wake up at all. I have been to the zoo myself but the lions where fast asleep the three times I got to the lion's pit during that day. Lazy beast :)
Since I am lacking in technical skills, I cannot give helpful comments. I am strictly a photo buff who is trying to improve, but as to telling you what is wrong or right, I am in no position to say. I am simply voting based on whether I like the picture or not. Sorry, maybe someday I will be able to give helpful advice