Reading a screenplay should give you the sense of watching the movie. There are times when it’s appropriate to mention angles, just as it can be necessary to point out costuming, or music, or effects in order to let the reader know what’s what.
Words on the page
Writing for VFX
The director, cinematographer and visual effects supervisor have the final say about what the effects look like. But until these people come along, the writer is all those jobs
Avoiding cliches
Cliches are shortcuts. The more you avoid taking them, the more interesting the places you’ll end up.
Ad-libbing
Planned ad-libbing is like hoping for a white Christmas. Maybe it will snow, or maybe it won’t. Your sleigh better have wheels just in case.