3D object with felt pens

This image is from the entrance exam for the university. The assignment was simply to take an A4-size sheet, make a 3D-object out of it and depict it any graphic way you like. This was the first ever study picture that I made using felt tip pens. I thought it would be a good challange, and it was. I used two pens, a darker redish one and an olivey green. The challange was not really when to use which pen, but to manage to finish on time, as time was short and the papaer so big. Still, it turned out to be a good idea to depict the object this way, because most everyone used charcoal or graphite, and this was a handy way to stick out from the crowd. All in all, there were some 270 people wanting to get admited to the Graphic Design Dept. of the university, and only 16 were chosen.