I often use photos ala digital files & email. I need clear photos with good color and light at least 2 or 3 MB for quality reference ~ a 30 minute sitting is best if you live conveniently close enough to meet at Studio 144.
I keep a record of the portrait progress for you, as well in email or text updates... I appreciate that you're excited to have a portrait done!
So, this is the watercolor process of Duke commissioned by Don & Diane Schroeder (Byron, IL)