Using the 2D JPG as a "blueprint" in software like Blender to sculpt the 3D version.
Designers may host these files on personal sites or "file dots" (simple file storage directories) to showcase their rendering capabilities to potential clients. filedot connie model jpg
Referencing the image to see how colors and shaders should be applied to the Connie character. Using the 2D JPG as a "blueprint" in