I feel Spartak Parjiani is not convincing

Spartak Parjiani as Actor has some moments that stayed in my mind. For me, it does not feel very real in many scenes. Some emotions are too simple, and I cannot believe the character enough. I do not hate it, but it did not pull me into the story. The role needs more detail, but the performance stays on the surface. This is only my personal view, but the performance changed how I enjoyed the film.