Yeah, Tarzan is actually standing there, while your guy appears to be walking. OH, and I honestly and truly care about each and everyone, who comes here and fills me with as much joy as you do! So, naturally I'm super happy to help where I can, when I can.

Soooo...as artists we are always growing, always hungry to reach greater understanding, to wield our chosen medium with ever greater control and bring subjects of our imagination into an existence that can be read and received, even experienced. To do that it takes quite a few disciplines to be mastered. In no particular order this would be the skill to use which ever medium we chose, the understanding of the nature of our subject and the awareness of known experiences a viewer would apply, studying your work. To cover the latter, it's most powerful to faithfully observe and study your own experiences. What do you know? What have you seen? What can you imagine? This involves physics as much as it does anatomy and a certain concept of biologic synergies. The more something makes sense, or the more you have control over the sense, the greater the clarity and consistency of your artwork.
You can't cover everything at once. It just doesn't work that way. The trick is to keep making more art, figuring out what you know already and work with it to stumble and fall so you can examine what made you stumble and get up to run into the next set of obstacles, armed with your new experiences. Piece by piece you peel away the layers of unknowns that nobody would ever blame you for. And those layers have countless forms and origins, come from various disciplines- as I already mentioned. But you have to encounter them. Just "knowing" about them only gets you so far. That means: I always urge people to make mistakes, hahaha! Don't ever drag what just happened with you, but learn from it and then leave the mistake behind with gratitude!