I like it. You've painted the head differently then the forgeworld site and it's good to see a change. I also like how clean he is, like he just started the fight instead of being part way through. Your metallics (
nmm i'm guessing?) came out nicely, though the blending from the silver to flesh seems a bit flat to me.
The one thing i seem to get distracted by is how you've posed him. He seems like he's swinging too far down, though i suppose on the site he's posed to be swinging upwards towards Fulgrim. Though because of the pose, the third picture looks like he just cracked a marine in the skull
Very nicely done and i'm sure the client was very pleased with it.