1. sketching, use ur favorite brush, i use no eraser to make it quicker.
2. enhancing level 1, make the line cleaner.
3. enhancing level 2, clean it once more.
4. tracing, use solid hardbrush.
5. color testing, make some quick splash under the line to get color preview for ur guide later.
6. do grayscale toning first, so u don't have to take care about too many colors.
7. coloring, make a new layer with "color" mode, add another layer with "overlay" and or "soft light" and brush it with light colors to call for highlights.
8. painting, merge all color layer and start blending.
9. tinting, tint the linework with local surrounding colors with "transparency lock", merge it down and then blend it with color layer. i cahnge her mouth so it will match with the whole design later.
10.put some design elements here, there, and we are done.