Hi Loi - nice eye contact with the young bull and it's not always so easy to isolate one of these, so good job on both counts. I think you can still bring out more detail in the darker areas and open up the shadows a bit.
Nice head-on pose here Loi, with good detail overall. I'm seeing a hint of magenta which you could tone down in the buffalo's hide.
I agree with Rachel that there's a tad more to tease out here...