Good, thorough muscle studies of the arm, but I think it's important to contextualize these kinds of studies, too. Like, maybe more studies demonstrating the attachment to the shoulder and proportion to the upper body. Also, I think it's important to work on the hand in addition to the arm, or at least simplify it in a more three-dimensional way. At the moment, the hands look flat and significantly less thorough than your muscle studies, and it's distracting. I almost want to see you study them as thoroughly as you have the arms... but maybe you plan on doing that?
Alright whirly! More life drawing! I think some of these would be strong of you could imagine the silhouette and NAIL it. Like the soda bottle is looking a bit weak. Stuff like that. Also the character on the bottom right is cool. Inception and everything.
Ah i knew the animation looked familiar i saw the Gotye video a while ago i really fell in love with it. Keep up those studies man your really improving. Remeber to focus on balance as well, try working with action lines or a line from the pit of the neck down to the feet and make sure their center of gravity is on the line or make up for counterbalance. Having a good sense of balance will give your figures more of a "weighted" look i find. keep it up