Videos such as this show the elbow position and how close it is to the body for representative forehands.
Could someone find videos of better pro forehands not just an incidental still?
I believe that Tsonga has a more tucked in elbow on average.
We have been discussing the same 'elbow tucked in' issue on
See reply #46 and earlier ones by Limpinhitter.
You could not pay me to hit a ball with the elbow angle shown by the OP, Reply #7. I would be worried about Golfer's Elbow injury. I'm not qualified to know how injuries are caused.