Great head on shot. We couldn't get anywhere near them in Kenya. If its in your ethics I would clone out the two random pieces of foliage edge of frame.
This image gives a totally different perspective. The depth of field is sufficient to cover the entire head. Background is nicely diffused. Looks good to me.
Cheers,
Sabyasachi
This is a nice view with the whole head in the DOF and illustrating some behavior as well. The exposure and background are also well done. IMO, this would be an even stronger image as a vertical showing more of the neck. :)