Please ignore the messy geometry, did this as a sketch and didn't optimize. Based off this awesome design by Shaun Bryant in Character Design Quarterly #1 - you can see the sketch at the top right hand side of the page here: https://youtu.be/NjAKzXI3rZg?t=71.
Sculpt created in ZBrush, final images and progress GIFs created in Photoshop.