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This is a practice that can often be overlooked by a freelance graphic designer. Using a Model's Release Form gives you protection from lawsuits and angry responses from models. Include a statement that the model may include a "distorted representation" to cover any limitations to your design. A blue face to represent cold may be ideal, but if your model doesn't think so, you may have to start over.
If you hire a photographer, make sure they also have model's releases with the work you have assigned.