Whenever I do bicep injections they're much higher up on the arm than indicated in your pics. Also in the bicep 2 pic it look like he's going in at an angle???
I've only recently started using bicep injections, but I, too, inject much higher on the bicep. I read here on the board that one should flex the bicep and mark the area where the peak is, and then extend the arm for the injection..... turns out that the area is a lot higher on the arm than I had assumed.
Oh, and I've only used the 'angle' injection methond like in bicep 2
This I'm sure will help alot of bro's when it comes to bi & tri Injections myself included.
I don't know about the chest one though still alittle scary. ..lol