右上は右腕~肩が死ぬし、左下は首が死ぬんだけど、みんなこれで元気に漫画かけてるんすか…?
A tip that addresses one of the most common issues I have seen with my students:
Make sure you sit facing straight towards the CENTER of canvas or drawing surface. You also need to be far enough from the drawing.
It is not even about posture (also important), but view angle