For:
Blending on the red (very nice)
Base
Purity seal
Against:
The way his face is connected to the shoulder. (however this is the sculpt so isnt really your problem)
Blood (it needs to be a darker red, nearly black in places)
Chainsword (this is only minor, maybe try for a differant colour for the chainsword casing instead of it all being metal.
Overal i very nice piece id give it a 7
(i hope i haven\'t come across as being to critical

)