>>4322489I mean that's from anatomy for sculptor which is made and confirmed by pros...
in this view it makes sense that the triceps show more than the biceps, same for the deltoid since in this position the upper arm is angled toward the inside
You can try it yourself, there's no way that in this arrangement the biceps is going to point 90° toward the front, you would need your arm in supination for this feat
>>4322519it's the correct version, tripfag got it wrong