I tried drawing perspective lines over the face, though I had a bit of trouble with the box. One thing I notice you're doing is that it seems like you're interpreting contour lines as a perspective point, and not 'seeing through' the form to where the other points are (e.g. occluded nostril, occluded lip). I'm interested in seeing the other answers about where the box is.

It's great you're practicing! My advice would be to focus a bit more on proportion, I notice some of the arms are disproportionate to the body, and to also make sure everything is aligned to a center line (spine), sometimes the torso seems disconnected. But other than that, the pose is communicated along with the direction of body parts. Keep it up!