Good going.. can see you're doing well with whole body.
The issue only is arising when the foreshortening (body/object moving away or close to the camera) is happening.. to tackle this, you can practice drawing 3d simple objects like cube and cylinder in space from different angle and rotation.. using that you can inscribe limbs like arm or leg within cube, whenever foreshortening is happening at certain part.
Could check out, how to draw in foreshortening for Human, by proko or other.. available for free on Youtube.. otherwise you're doing great..
The issue only is arising when the foreshortening (body/object moving away or close to the camera) is happening.. to tackle this, you can practice drawing 3d simple objects like cube and cylinder in space from different angle and rotation.. using that you can inscribe limbs like arm or leg within cube, whenever foreshortening is happening at certain part.
Could check out, how to draw in foreshortening for Human, by proko or other.. available for free on Youtube.. otherwise you're doing great..