If you are the director as well as the writer, certainly. If not, the answer is a bit more dicey.

Directors can get annoyed with writers inserting too many directing notes in screenplays, as — after all — that’s their job, and those choices are theirs to make. Both in addition to and because of that, too many directing notes makes your screenplay feel unprofessional. They also can break up the flow.

That being said, occasional necessary directing notes can be okay if used sparingly. But remember that the director makes the final decision anyway.

There are ways to couch the same message in action or description without noting the director. In the links below, John August answers different forms of this question and provides various examples.