Struggling with construction

I'm trying to understand the pelvis and the torso as boxes with planes, but I have no idea if I'm even close to getting there.
I know the theory more or less, but putting it in practice is another story. For example here, was I even close? I honestly can't tell.
https://imgur.com/a/QwzucNA

You need to start thinking of the picture in front of you as a 3-dimensional object. In the drawing you've shown, the 'construction' is cubes floating in space, all with similar edges. In reality, the woman in the picture in sitting in an area with a foreground and background, a plane. Similarly, your cube constructions should follow the lines of this plane. I've attached a quick drawing that hopefully helps.
https://drive.google.com/file/d/1ecjGrEhVztgbLM7B0LwVN0juG8wHfwOz/view?usp=sharing
The strong point of gesture drawing is that you can get the rough idea of how limbs and torsos exist in an area without thinking too hard. It's fine to want to stick to cubes and such but I would suggest looser lines that push the accentuating areas of a figure, since you seem to understand WHAT shape these forms are generally in.