This is the pose of a person who holds hands in a straight seat (it is necessary to adjust the angle of the part according to the body shape).
As shown in the attached image, the knee penetrates, but since the pose prioritizes the feeling of weight of the upright seat where the heel and buttocks are attached, I think that the human body will be natural if the thigh is inflated upward when drawing.
正座で合掌する人のポーズです(体型に応じて部位の角度調整が必要)
添付画像のように膝が貫通していますが、かかととお尻がくっつく正座の重量感を優先したポーズのため、作画時は大腿部を上に膨らませて描画すると自然な人体になるかと思います。


↓ Gassho sitting on a chair (for female body shape) is also available [Content ID: 2124165]



↓椅子に座って合掌(女性体型向き)も公開中【コンテンツID:2124165】
