With that in mind, I’m going to be completely honest on all parts.
The topo is basically completely useless as it is right now, there is nothing in the face that would allow him to open the mouth or close the eyes, no eyelids, no jaw, the legs would be very hard to skin and deform the way they attach to the hip and just overall your topology doesn’t really support your shapes, muscles etc. at all. I would suggest you read through this: http://www.cgfeedback.com/cgfeedback/showthread.php?t=1449
Just the fact that there isn’t a clear definition of any of those plates he got all over his body, would make rigging impossible, they can’t move or slide if they cannot be skinned individually.
If it is for portfolio it wouldn’t really make sense to take the lazy way in any case would it?
Anyway, on the sculpting side it is looking good.
On the design part I think you would need to make those fingers thicker, they look like they are about to break, and the toes feel a bit neglected.
And this is just my personal opinion for a portfolio piece, but I think the design is very similar to Jesse Sandifer’s work, which is a bit of a shame, it doesn’t say that much about who you are, which properly isn’t a good thing if it is a portfolio piece, you need to stand out. By going this route you are automatically putting yourself up against Jesse, most people have properly seen his images, are they have been used for splash screen in mudbox.
So on a final note, on the sculpting side, you can definitely handle everything, it is looking very solid! you obviously know the ins and outs of zbrush which is a great selling point!
But I think you can push it further I would like to see who “Berserker44” really is
And then you need to dive into the wonderful world of topology (which actually is both fun and challenging): Do you know any riggers? If you do then I would ask them on guides for what they want on the topology, maybe even give it a go a rigging it yourself, then all the mistakes in the mesh will be obvious because they will be hard to deform.
Fred