Thanks to everybody for the feedback, I have made a decision after talking it over with different people and taking another look myself at the work. The middle sketch is the one that I will be going with–there will be more surface area of the boot to contrast with the white of the paper and egg. To help to achieve that effect, I turned the contrast way up in Photoshop to help see the areas of solid black.
Stay tuned Thursday and Friday–the assignment is due on Wednesday–for the finished drawing. In the meantime, here is a teaser:
In the third picture, I placed trace paper over the finished areas to keep the graphite from smearing.