The Supreme Court struck down a similar law in 2002. Ashcroft v. Free Speech Coalition, 535 U.S. 234. The Child Pornography Prevention Act of 1996 prohibited “any visual depiction, including any photograph, film, video, picture, or computer or computer-generated image or picture” that “is, or appears to be, of a minor engaging in sexually explicit conduct”.

I haven’t seen or read the language of this Louisiana law, and presumably intelligent law-makers would be aware that a law with a similar intent has been ruled unconstitutional, so maybe they changed enough so that this one will hold up.