I don't honestly think he wants you to Crit his work!
He's posted it in Finished work, and he is quick to his Guns, when someone makes a comment that questions the models Accuracy, and/or completion.
You will probably find he doesn't want to work on this model anymore (as he's probably been going at it for awhile, or he has other projects to attend to) so he's probably not going to make any changes. Or put your advice to work.
I'm not trying to be offensive... just trying to point out the obvious.
@Tadpole. I actually think your model is good (Though it's not an accurate model of JC)
"Your weapons are no match for ours! People of Mars, surrender!"
"Um, this isn't Mars. This is Earth."
"Earth? Earth-with-nuclear-weapons Earth?"
[long pause] "Friend!!"