1. start with a tiny quick sketch.
2. using the sketch as reference i do more of a detailed sketch.
4. using one of the dry media brushes in photoshop i start painting detail in and shadows.
5. some flat colours.
6. mix the flats with the greys, i lowered the opacity of the greys here.
7. i added a glow to the meth and a bit of a shine to the glasses.