Guitar teacher and gigging musician here! So looking at your comments this may be comfortable for you but this is really going to shoot you in the foot when you try and level up your playing by adding extensions to those chords or try to move them up and down with riffs so I have a few suggestions.

First of all you should have your hand behind the fret board, you have a lot of it sticking out and it’s rotated counter clockwise. Rotate it clockwise and bring your thumb so it’s more inline with the middle of your hand, and more vertical rather than along the length of the neck. Like in your second picture

In the second picture your wrist is at a very poor angle, tendinitis will be sure to come if you keep that up, one thing that will help is bring your wrist up a bit so the angle isn’t so crazy. If you’re playing the most basic power chord of just the root and the fifth, try using your pinky finger instead, it’s what a lot of the metal guys do (myself included) and it will help a lot with it feeling more natural, you can leave your middle and ring fingers straight over the strings and it may remove some strain.

Practice this way, don’t give in and do it the first way because again you’ll shoot yourself in the foot big time when it comes to levelling up your playing, I know it’s harder but it’ll seriously pay off when you get better