[deecee4]

Nah, it's the brachialis, I'm 100% sure. It's subtle but you can make out the pronator teres muscle wrapping over the brachialis muscle (it's the spot that has the brightest highlight on the tattoo armband). Pronator teres connects from the medial epicondyle(which is about a thumbs width away from the elbow bone) and crosses over the brachialis to the radius bone- it's the muscle that's largely at work when you turn your hand facing down.
Anyway, my point is pronator teres always wraps over the brachialis and doesnt wrap over any part of the bicep. Ever. It's clear that's what the sculptor is going for tho...and what's weird is that this looks like the same sculptor who did their Kinnikuman figures and the anatomy in that particular area is fine, it's simplified but makes sense in comparison with real anatomy.