'Shooting half a person's face off' seems like it should be "M"-rated.
As a rule of thumb: "T" is more for cases where there's "some" violence. 'Murder with firearms' in general is rarely "just a bit" violent. ;)
Also: Didn't you upload that animation already?
Lolbackwards
Your animation is very good! I already check it! And the teen rate of this new I think that it could be proper, because talks about an animation with the teen rate.