Speaking on the set of her latest spread for i-D, the Harry Potter star recalled how she and photographer Mariano Vivanco had come up with the character of a French maid for her to portray during the shoot.
"This is the second time I've worked with Mariano. He's like my naughty big brother. We do our own thing, leave the world behind and go off to create and invent stuff together," she said.
"Being myself is a lot of pressure. I feel a lot more insecure being Emma than if I take on a character."
Watson explained: "I wore a little bit of everything for the shoot, including the beautiful Azzaro dress that I ended up wearing for the Lancôme event. Mariano was going crazy, chasing me around the garden, while I was pulling on different dresses and turning every which way.
"The more I do this, the more I learn what makes a photograph. I love fashion photography, I love partnering with photographers rather than sitting there like a vegetable."
Thanking the photographer for teaching her "how to be a model", Watson added: "He's been very supportive of my career and definitely very involved in the decision for Lancôme to take me on."
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Watch Emma Watson in the trailer for Harry Potter and the Deathly Hallows: Part 2 below: