you have to kill your hollow inside of your mind
Renji? No, he isn't part hollow so he can't get a hollow mask.
Ichigo doesn't have his hollow mask in Shattered Blade but he does have it in Versus Crusade
No, She is a Human.
So far (atleast as far as chapter 399) it hasn't been comfirmed yet. Well Aizen did say when it was revealed when some he new had a hollow mask that he is to good for a hollow mask, he goes on to say that only a weakling would need one.
The YouTube video channel contains several tutorials showing how to make a hollow mask from papier mache. The eHow and Instructables websites also give information on how to do this.
It's simply called a Hollow mask.
You cannot earn it. Sadly, you must buy it.
When a Hollow's mask is completely removed, their true form is revealed, which is a mindless and animalistic creature called a Menos Grande. The Menos Grande is a far more powerful and dangerous form of Hollow capable of causing significant destruction.
leveling up
you have to buy one.
While I don't fully understand your question, I think the answer you're looking for is a "Vizard." In Bleach, a Vizard is a shinigami who has access to their hollow's mask and power. Basically,
no, he was just too tired or his inner hollow was winning over ichigo