The details are amazing and give it a natural, realistic touch. Great work!

There isn't much to criticise (at least I hardly find some negative aspects) but you marked it as "critique requested", so I'd like to add something. I have the feeling the horns wouldn't be symmetrical if the gazelle would turn its head toward the viewer. (Of course, no being is completely symmetrical but..) Also at first glance I though they should be very slightly overlapping at one point. Unfortunately I'm not that much experienced with animals with hornes so I can't tell exactly which horn should be moved to which position or even draw a redline. That's just my personal impression at first sight. I might be completely wrong. xD

Nethertheless I really like it. More gazelles! ^^