A very nice portriat here. No major problems. The low sun angle shows off the stripes on the wildebeest nicely. I might like a bit more room all around. The shadowed side is a bit dark, maybe a little pp work could lighten in up slightly..
Arjan,
The quality of the light is great. However, it would have been better to be shooting with the sun at your back--from the left--to avoid the shadows. This would have resulted in more of a profile view, so you would have to have waited for the Wildebeest to turn back towards you.
Also, be careful of the legs, as in this image they are merging together.