For me, the photograph is the most important step because it determines how great a portrait will be. Before I even start sketching my subject, I carefully study the photo I've been given. I have a mental checklist of things I look for: 
- Detail
- Clarity
- Color
- Expression
- Lighting
- Sizing
- Positioning
If I find that the photograph doesn't work, I either ask my client for another to replace the first, or for more photos for detail. Sometimes I even take the picture, or work with several photographs to get just the right look. Once I've sketched my ideas, I present that for approval. Usually it works out, but sometimes changes are necessary. Its all part of the process.
