It would help if you could give some Jurisidictions (I am assuming America, where most religious characters are considered Public Domain or Scientology). Moses and Pharaoh (traditionally Ramses "The Great" aka Ramses II, though no historical evidence exists. The historical Ramses had a much longer lifespan than the Biblical one.) are certainly public Domain. Certain elements from more recent depictions may be considered problematic (i.e. Try to distance from Prince of Egypt in characterization.) but generally, it's nothing to be concerned about. A good idea is to depict Moses as a stutter, which is detail that doesn't show up in adaptations of Exodus and has some biblical support.
Blasphamey might find some issues in Islamic Nations, due to the taboo of depicting Prophets of God, which I believe (but may be wrong) Moses falls under (Jesus too, as Christianity is an older religion than Islam by 600 years give or take). Islamic nations would be the only problem culture with this as Israel is the only nation with a majority Jewish population and it tends to be more Secular in it's laws regarding fictional works and depictions of Biblical characters is not a taboo (though God and Angels are often not given humanoid figures... in the Bible, Moses was nearly overwhelmed by seeing God from behind, let alone his face, and the Angels were not usually creatures that were pleasant for humans to look at... there's a reason why "Fear Not, I am an Angel of the Lord" is almost a catchphrase with the angels.).
In terms of Christianity, there are few taboos against depictions of biblical figures. Eastern Orthodox sects tend to have the most taboos, but these are for statues of the biblical figures and saints. 2D paintings are fine by them. As a rule, most majority Christian nations tend to no longer have blasphemy laws, so there shouldn't be any issues.