In general I would say, that a very detailed direction of how something is to be set up or shown is not good. In other words I wouldn’t write about camera angles, musical cues or certain lightning setups, as these seems to be elements that you mostly find in scripts of newcomers (which I am myself…).

As Robert McKee states the visual style of the movie is up to the director and director of photography. Hence, I would try to reduce anything to its most important parts. But that is no problem at all. If you have a certain image in your mind – a red car for example – write it as you “see” it. As a result, the director would most certainly show a red car in the final result. If you see the car from a certain angle, try to describe it using other ways (the sunlight hits the tires in a harsh angle or something like that).

As for your “3D” question: although I don’t quite understand how your script is “3D” (some kind of description?) I personally understand 3D, or animation in general, only as a different medium to tell a story. Therefore I think the normal way to write the movie would be the best (which I will wo when I leave the story design phase of my 3D project).

Much more important to me than the medium seems the genre you are aiming for. Is it a comedy? A horror comedy? Or perhaps a drama (an animated drama – that would be beautiful)? If you know the genre you can search in the internet for some scripts that have been made and learn from them. And to make good comparisons you could also try to find some scripts of 3D movies.

One general challenge we screenwriters have to face is this: for one thing, we have to write a good story. But for the other we have to write a good story well. If you want to sell your script it has to be good on the story level and on the writing level. Not only the audience but also the reader has to be captivated.