>>11363943
Here's the catbox one. I could make a similar diagram for the upper body, although making a diagram is probably more helpful than studying them. I included a quick one I just made because I wanted to make sure I had the muscles right (it's obviously a low res one scaled up. I stole the sample). I find the crossections combined with the view of the body to be more intuitive because the cross section alone doesn't give you any idea of the length or origins and interactions, while the front and side views fail to convey the actual sizes of these muscles.

>I tried to give it that sort of q shape, but I failed at managing space properly.
Given how it's a product of the lateral head attaching alongside the tendon, I think you would want to have it be more horizontal or perhaps even curved because the thickness of the muscle belly would be pulling it further away form the humerus. A major downside of these diagrams is they don't show the shapes and sizes od muscles when they are flexed. It's probably because they are mostly derived from cadavers, which can't exactly flex, but you can also find ultrasound imaging for finding muscle crossections (so maybe there are flexed comparison)

>Are you an artist yourself? We should hang out more and talk anatomy
Not really. I've been getting into art, but I mostly just write and do some edits. I know anatomy from working out as when I started working out I used anatomy charts to figure out workouts by looking up their functions or just search "(muscle) workout"
Can still talk if you want. Discord is contaminant_core