Given this gray area of what is "mature" and "legal" or "Illegal" or "Imoral" this is not going to be settled. but if I may.
1) Pornography is always considered a VISUAL Media: print, photos, drawings, etc
2) Most places count Child Porn/Pornography as illegal, even Japan has anti-childporn laws despite the drawn lolita art. (lets not get into this)
3) Depictions of violence such as movies, drawings, etc is not illegal. Photos of RL Violence is (most likely) illegal if not used in news/education/etc.
4) Depictions of Beastiality is subject to local laws but most do not count drawn or a