The figure in the middle turned out wrong because a. I used perspective in my box, which wasn’t necessary and b. The boxes were slanted too much into the body. The figure at the end was my correction of that mistake.
Although there are some mistakes in this attempt, like the waist is too slim and the torso is too angular, I finally understood the concept of the box while drawing this. Also, if you look closely at the figure’s feet, you will realise this man isn’t fully naked. As Prof Woon Lam always says, “Drawing is Yeezy”.