Create line drawings of children solving math

I need someone to illustrate 12 line drawings of children solving math. 4 of these images should depict a child explicitly stressed out; 4 should depict a child explicitly concentrating/focusing on the task; 4 should depict a child demonstrate something in between stress and deep concentration. These line drawings should be realistic and not cartoonish. I am not looking for extreme detail. Here is an example of the type of drawing I am looking for: [login to view URL] If you agree to accept the project, then we will go through the following timeline: 1) I would ask that you send one rough sketch of a concentrating and 1 sketch of a child stressed out. I will award $5 milestone. After I give you some feedback, you would proceed and draw the rest of the images before I release the last milestone. I would like this project to be completed within 1 week.