Using new software (such as Maya and Zbrush) is like playing a highly technical advanced video game (blindfolded), with a controller that makes the Death Star look like a beach ball - and the game is to figure out which buttons make your character jump, crawl, spin and ultimately level up...and once you figure it out, accidently click a button you didn't know existed and jump into a completely new game/world/scene; freeze your software, loose your tools/emblems/wands/gems/coins and watch your Death Star incinerate....
Not today Zbrush!
Ice man creation....
Import Turbosquid model as an .obj file
Use the sculpt tools (clay build up, move, smooth and Dam Standard) to apply the muscular structure....remembering everything that was taught in Elizabeth Hammond's life drawing anatomy classes at Medway College of Art & Design (Kent Institute)....particularly the structure of Gluteus Maximus