For most players, outside of a school in France, we encourage the student play off the left edge of their nails. You should seat the string on the flesh and the nail at the same time in the little gap on the left edge of the nail (called the subungle). It seems from the angle of the camera that your right hand is rotated to the "a" finger, so that the right side of your hand is closer to the guitar than the left.
You should understand that there have been some great guitarists who have played off the right side of their nails. But it is the exception and not the current standard. I have also seen a mixture where "i" and "m" are off the left side and 'a" is off the right that sounds good, too. In every case, though, the string has been seated the same, at the edge of the subungle.
Also, you should learn to flex the tip joint of the thumb; it makes for much less effort/tension.
Lastly, I previous posted that you should learn to keep the 3rd finger of the right-hand parked above the fingerboard, and avoid any unnecessary motion or tension, like resting it on the string, or fully flexed outward (or into the palm, for that matter).
Dr. Lawrence A. McDonald, D.M.A., Art Kaplan Fellow
Author of The Conservatory Tutor for Guitar
2018 Michael Thames "Ancient Dragon" Cd/Ir
2008 Michael Thames Cd/Br
Royal Conservatory Advanced Guitar and Theory Instructor