For example, this ship. This ship was recreated from a previously selected photo. The ropes on the ship made for a difficult project but one has to be precise and careful when drawing to make sure the ropes and sails don't muddle together. This drawing was first done on tracing paper and once it was completely finished, the artist used a pencil to put graphite on the back of the paper like so:
After covering the back with graphite, one transfers the image drawn to regular paper by lightly tracing over the image which transfer some of the graphite on the back of the tracing paper to the regular paper. It's pretty phenomenal.
As an artist, one needs to be able to draw in multiple kinds of formats. For example, this model for fashion design. These models are measured by the size of their heads and are usually 9-10 of those heads tall. They are long and willowy looking as fashion models usually are.