Analysis of information sources in references of the Wikipedia article "History of science fiction films" in English language version.
We only used footage from Force Awakens, there really wasn't anything from Last Jedi that was not used in that movie.
[A] big contribution to ILM's efforts was Knoll's discovery of a mold of Cushing's head that was cast for a 1984 comedy film. The visual effects artists took a scan of this to give them a fully accurate digital model of Cushing's head.