The long neck is called stacking in bodybiulding and dance. Think of a string on the top of your head pulling you up. You'd get whacked with a sick back in the day if you were caught not stacking.
He has a bad tee-shirt tan, where he was outside in a tee-shirt and his head and arms got tan. The veins show up when you get the muscles under the skin to push out. And the shadows are the result of the side lighting.
If it was edited, someone needs to find a better hobby.