Four stages of tumor progression

This is a rough sketch of an illustration I'm doing for a brochure for a non-profit research institute. I skipped a week of posting because we were on vacation. It was our first trip with the baby, and I daresay we all three scarcely emerged unscathed. I meant to post this sketch, which I finished the day before we left, while we were on the road, but if you've ever traveled with an infant, you will not be surprised that it didn't happen. That said, I was able to get a little bit of work done. After the baby went to bed, I worked on another sketch while standing at the sink of the hotel bathroom where the light wouldn't wake him up, then took a picture of it with my phone and sent it to my client in Germany. I guess the flip side of being able to do this job from anywhere is that I am never really on vacation.