Gargoyles & Grotesques Collaborative Artwork: Creating this collaborative artwork teaches your students observational drawing skills. It also gives them an opportunity to work as a team.
Students work in groups, with each drawing a piece of the picture that combines to create a large artwork. The lesson plan is full of useful advice.
The 16-page PDF can be printed A4 or letter size. This download includes:

Materials required: Drawing pencils and paper. You could use graphite transfer paper (#Ad) if you wished.
There are more collaborative art lessons on The Arty Teacher website that help develop both art and teamwork skills.
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I have been a high school art teacher for over 20 years, so I understand what it’s like to be in front of a class of students, often with very different abilities and attitudes.
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