I feel Venus Kanani is not convincing

Venus Kanani as Casting in Within (2016) made me pay attention more than I expected. The role needs more detail, but the performance stays on the surface. I do not hate it, but it did not pull me into the story. For me, it does not feel very real in many scenes. Some emotions are too simple, and I cannot believe the character enough. I remember both the good parts and the parts that did not work so well.