Nicely handled background here. I think the crop is a little close to the nose...I'd rather the extra space that's on the righthand side be on the left so that he could be looking into it rather than looking out of the frame.
great shot, not sure the BG has a lot that "adds interest" to the antelope. It is a great shot, but the bokeh seems necessary for the portrait rather than adding interest.
this is nice. great sharpness... and really great color. meets the challenge as well. only suggestion i could make is to get down to the animals eye level if you can, as this really helps to bring out catchlight in the eye, an dget down to the 'animal's level'. good luck.