Thou Shall Not Kill- WIP

This is a concept piece I started a while back. This rough sketch was inspired by a comic idea I had. It is a dark comic about psychotics who's mental illness manifests in dark powers. Think Carrie minus the prom. This scene depicts one character, a priest, who is tormented by murders he's unconsciously committed. I'm posting this so you can see a little bit of my process. I start with a blue line rough. After that I set up three different layers: mid, shadows and highlights.