Nice studying! I like the twists and consistency in your forms. Just watch out for the proportions you are using to indicate the ribcage. About the top half of the current bendable area would actually be part of the ribs instead.

Every time you start again, you should feel more confidence. You have inspired me to start again at the bean and robobean. I've been doing several faces, upper-torso studies. I feel pretty good about them and will post soon. On a side note, pay close attention to what Proko says about the proportions of the rib cage and pelvis. That will help you in this current exercise.

I think you did a good effort to capture the gesture. Just wondering, are you new to persective? It looks like some of your boxes are not in perspective. It doesnt have to be perfect, but if its off too much it gets noticeable. Good lucky with your studies!

I redid poses 1, 3 and 4 after watching the Robo Bean critique video. Hopefully they came out better than my previous attempt.

Attempt #2

I so admire how clean your lines are and how you've given us photo references. Page 1, upper right one where you compare yours with Proko's... I think the main difference is that Stan is using the rib-cage for the box; where are you are describing the whole torso with yours. So if you look at his rib-cage it is a lot more vertical than the one you "x"ed. One way I am very rigorous with myself is that I overlay my version on top of the original. This is very easy if you are drawing digitally (with layers + some transparency); but you could also use tracing paper. That way I can see immediately where I am off, and by how much. Since Stan sometimes exaggerates his angles, so when I overlay his on the original it also allows me to see how much he has exaggerated by; and thus I have an objective basis to gauge angles and measurements.

Bravo! love how clean your lines are; and the poses are really interesting (and difficult !) Number 1 the top edge of the torso rectangle, the line I think should be slanting downwards (check the angle of the shoulders), which would give your upper box a more of a tilting backwards feeling. The front of the pelvis box I think faces more away from us (rotating slightly more the left of the picture), which would give us more of the twist. Number 5, this is a tough one ! The shadow patch on the right shoulder is deceptive, as is his right leg, which is angled out from the pelvis. I had to get down to mimic this pose with my body to try and understand this one and after a lot of work I conclude that your correction (b) has all the angles as I would measure them. But intuitively, something feels slightly off. Is it the lighting and/or the addition of the arms that is making the torso feel like it has a bigger twist than the actual landmarks of a robo-bean ? thanks for making me really analyse these poses.

I think you're running when you should be trying to walk. What I mean by this is your lines are too quick and you're committing too soon and not considering the forms of the rib-cage and hip. You also seem to be also struggling with perspective. I'd suggest going over the bean again and practice drawing more boxes in perspective. I've included below an edit of your image to help. I'll just go over that now. The bean as drawn in green is how I like to approach the bean, I like to find the vertical and horizontal lines that help show it in 3D object in space, this makes it a lot easier to then make a box out of it because you've done a lot of work. . I hope this is helpful. 😋