Found this one while looking at my files, This was taken in the Mara about 4 years ago, before I started shooting in RAW. The side-lighting was a bit of a problem, but I've tried to work with it. In retrospect, I might have gone for less depth of field.
Canon 20D, Canon 100-400 at 220, 1/640, f/8.
BTW, he is one half of a mating pair, and I've always thought he is almost grinning.
Great expression on this majestic king of the bush Cindy. Yes less DOF would have helped a bit to emphasize the lion's head. This would also work well for a tighter portrait, but you probably have one seeing that you made this @ 220mm. Btw the contrats in your image looks fine to me.