First I sent her the following three sketches, using the magazines template to position the elements to work with the type and label.

Version One: Patterned background, organs, which are illustrated in pen & ink style are highlighted in rectangular solid shapes.

Version Two: Plain painterly background, organs depicted in realistic medical illustration style, no backgrounds to highlight them.

Version Three: Another painterly background, but in warm colors, and organs are highlighted by rectangles.
Janna chose the patterned background, but preferred the organs without highlighting shapes behind them. So I went to work on tweaking the figures, completely changing a few, and here's how they came out:





I'll post the finished cover tomorrow.