First thing I noticed (and really like) is in the last picture. Theres a gas can filled with blood. Haha thats a weird idea, I guess you gotta save it somehow for the blood god.
Theres alot going on on this guy (like most GW minis) but he looks good, the red is good, its deep. Overall Id say you need to push the highlights further, and in the case of the bone and skulls alot further. I think this will do two things, first itll help give him that extra something everyone wants to push there minis that much further, and tow, it should help differentiate the many many different parts of this guy. In other words itll help separate and help, lets say the leather strips hanging from his belt, define each one so its looks more like a group of strips and not a few defined ones and kind of a mass of dark brown behind those front few.
Hope that helps, and I do really like what uve done keep it up