Speaking to Hollywood Elsewhere, the young actress revealed that we won't be seeing too much of her as the blue comic version of Mystique, but that when she did appear she would be donning the scales and dye job from the previous X movies..
From Hollywood Elsewhere..
Only 10% of her screen time will be as Mystique, she said. It takes X-Men: First Class makeup artists about six hours to transform her into Mystique with the blue skins and the scales, she added. (She has a nickname for the process or the makeup or whatever -- "Mystink.") I asked if official photos have been taken, and she said the idea was to keep her appearance under wraps until just before the film's release. I said if the world has to wait until next summer for a shot, fine, but if an un-approved shot makes it onto the web I won't be sorry.
Still no un-approved shots unfortunately, but we do have this artists rendition of what Lawrence may look like transforming into Mystique..