I feel Garth Longmore is not convincing

Garth Longmore as Second Assistant "B" Camera in Walking Tall (2004) made me pay attention more than I expected. The role needs more detail, but the performance stays on the surface. 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. Many moments pass very fast, and I do not remember much after them. This is only my personal view, but the performance changed how I enjoyed the film.