hey , glade you liked it !!
Well workflow has nothing special in it , first I try to collect refs of what I want and make base in max , in this case I used a base I had before .
then go to zbrush and work on the model until I`am satisfied, then after that I used mudbox and photoshop to texture used mudbox amazing texturing tools and adjusted it back in photoshop .
the rendering was then done back in max using vray did quite lots of tests before finalizing it and some post productions in photoshop
hope this was useful in any way to you