Hello!
I am very excited about this project. I have a lot of experience with archaeology and history ( I've done an archaeological field school and I work at a museum) and this project would be personally rewarding for me to accomplish for you. I pay great attention to detail and in this case I would take extra care to illustrate all the accessories, clothing, and features as requested. I understand how important it is to depict archaeological artifacts as authentically as possible.
My only confusion about the project was whether you wanted the exact drawings provided to be copied exactly and then to have additions and changes added or if you wanted the characters completely redrawn based on the sketches. In the first case, I would use Photoshop to clean up the sketches, add requested details/changes, and, if needed, add color. In the second case, I would redraw the characters using a similar line quality as the given sketches with changes. In either case, I would make a digital image that is high quality and fit for use in a book.
Please feel free to contact me to discuss this further if you are as interested in working together as I am.
Thank you for your consideration,
-Beth