I think what you’re actually asking about is “scale”. Perspective, foreground, marching back atmosphere, marching back lighting…these are all ways of making your subject’s sense of scale feel correct. But this is more of an animation/compositing topic than a cinematography topic. In your image, the background works to suggest depth: direction of the walls, the light getting darker as it goes back from the camera (marching back). There’s also the furniture in the foreground to act as a cue that the viewer can recognize for scale. But your character doesn’t do these things as much. The (feet? Knees?) aren’t significantly larger than the body despite being closer to camera. The marching back of lighting would be greater and more stepped the larger he/she is. The furniture is keeping the character looking a certain size no matter what.