Level horizons work in some cases, in this case, it doesn't. It should have been leveled. I am wondering if the reason he didn't is because it would have caused a bottom crop that would have been too close to the lion. That probably could have been dealt with. If I had been one of the judges, I would have passed on this one. Sorry, it is just one of those fatal flaws (in a landscape image with a clearly defined horizon) that can't be overlooked. No different than a portrait where there is a tree coming out of the top of someone's head. These types of flaws are different from, say, a centered horizon, which is generally a no-no, but can be justified.