sorry if this has been asked before.i am making an outdoors scene with the camera looking out over a mountain would i give that since of scale to were it just vast and huge?(the mountain range won’t be the main part of the scene,there with be a character in the forground that the camera is focused on)

If you mean something along the lines of this
then just arrange your scene that way.
The sense of scale will be recognized by the viewer’s brain.
As long as you model everything to the proportion of a human.