Pretty new to Zbrush, here’s what I’m working on at the moment. Any feedback/suggestions most welcome. Thanks 
coming along well, looking forward to some more shots of this.
This is very cool, and coming along well, but it’s far from the point of looking truly alive. It looks too flimsy, like clay. Work on making the crab areas look more rigid, don’t be scared of the pinch brush. Try it with a high focal shift. Also, the human anatomy needs balance in the chest and ribcage. Some collar bones will help as well.
You’re good, just keep on working, be picky about every little detail, and continue refining the pose and anatomy. True ZBrushing takes a while. From my experience, this is about 25% complete, but the extra work will pay off.