Thanks guys, I've stopped sculpting this guy for now coz turned out there's some unwelded vertices around the base of the index finger. In the mean time, I decided to re-topologise this guy so I can save more poly for  the really fine details when I bring him back to Zbrush.

Dan, you're right he is a too human. I'm trying to make him more muscular and powerful looking than the game version and yet still look alien enough.  After i finish retopologising it, I'll sculpt some variation of the torso.

Xen, I'm goin for the concept art look rather than the game version, I don't know, I found it to look more noble than the game. Plus it'll look slightly different after i sculpt in the scales, but u're right about the nose, it's slightly too lumpy, i'll push it in later.

Here's the concept art example.