Be aware of the technical things of the camera . Camera is slightly above eyes. Camera loves certain people, hates others, it is in the bones of the face. Camera must be still before a cut. Directors know camera not acting.
Director turn actors loose on set.
Then lock it in for camera . Do less, camera blows it up. Don't self indulge, remain the actor until you step up to the camera . As actor you can listen to instruction, not in character. Do not repeat yourself, but do again what caused it.