Holy crap that's some gooood 3d printing! Seriously, I know it was only posted recently but I'm surprised this hasn't had a comment before now because the detail on those models is pretty damn good! I might be off the mark (I'm not too familiar with 3d modelling software) but it looks like you used a combo of Sculptris and Z-Brush? Like I said might be wrong there.
Regardless, looking forward to seeing what ya' come up with next