Years ago, my children did directed drawings of Abraham Lincoln and George Washington with their second grade teacher. It is one of my favorite directed drawing projects. Even with similar directions, students give their own flair to these presidential pictures. I borrowed the reference page from their teacher. It obviously came from a book but I do not know which one.
For this lesson, I was working with Kindergarten students. They used pencil for their original drawings then used permanent marker to go over the pencil lines erasing extra lines when they completed their drawings.
Once the images were outlined in marker, they colored with crayon. I did this in two 30 minute periods for this class. The first 30 minutes to draw the images, the second 30 minutes to color.
This was a very art capable group. If you try this with your students, you may find you need to adjust the time.