After many obsessive hours and small thumbnail sketches, I narrowed it down to four to show the patron.
To make a nice presentation, I created a generic sketch form on my computer. At the top of the page was a space for the patron's name, a space for my name, a space for the sketch number and the date. Then I created a square box that the sketch would be drawn in and on the bottom of the page I had blank line for notes. I printed out several copies and drew the final designs on these. One design for each page.
I think this seemed like a fairly professional presentation of ideas.
Next installment: the commission agreement.