① Settings screen → light source → Remove the check mark of the shadow.

Remove the extract line check mark of the ② texture and then the LT conversion
* Please change the line width and tone work by your preference. The line width is an illustration and 1px, and I think that it comes out neatly if it is 5px in the case of the cartoon.

After the ③ LT conversion, the extra lines are erased and finished!

Other >
Decoration with a pebble brush in the CLIP STUDIO material, it becomes it more.