8 Chapter Illustrations

I am looking for 8 unique illustrations to accompany my book (plus a simple company logo). The illustrations should look hand-sketched, yet still high-quality and modern. I am open to any concept (realistic/cartoon/abstract), as long as they are themed. The final output can be vector graphics, pen and ink drawings, or digital paintings. These illustrations will be featured in my book (at the start of each chapter) and must meet a very high standard of quality.