"[NOTICE]" About the support for Mac models
Cubism Editor is not supported with Apple M1 processors.
Please refer to System Requirements
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Please note that Cubism SDK is not supported with Apple M1 processors and macOS 11.0 Big Sur.
Easy & Accurate Guide Images for Different Angles
This "trick" will allow you to make very good, quick and accurate guide images to make those head and body rotations in Live2D. Here I will explain how to do the head.
-DesignDoll (The free version is good for what is done here.) http://terawell.net/terawell/
-Image Overlay Utility http://imageoverlayutility.bitbucket.org/
Make a head and paint over it, using an Image Overlay of your original character sprite as a template. To make the hair, you can make a larger head and put it over, and paint over that. Make the hair "head" translucent.
Next, just rotate the head in different angles, make pictures of each angle, and you now have great guide images!