Yes, his work is very nice... Zbrush central will either inspire you to make something amazing too one day... or quit and go cry in a corner
But if you look at his work, especially the progress shots. You will see that he has nailed his proportions early on. The proportions and anatomy of your piece are not very clear cut. And once you retopo it, I think you'll find yourself making large proportional edits to your mesh, which would have been better done earlier on, before retopologising.
It might also help to think about how your creature is going to live. He has a rhino/triceratops head, so I imagine he will be doing a lot of ramming? Yet he has the lower body of a more flighty/light footed creature and might not have the power to throw that head around?
You might want to try a heavier set design. Head sunk lower, and a large arching back, so that the head is the first line of defense, and that armor frill can do some protective work. Maybe design the frill to arch around more, so it protects under the head a bit more, as this frill evolved on a dinosaur that walked on all fours, how might it evolve from a biped?
Anyway, nice start so far. It will be fun to see where you take this.
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