You have a proper grip in the 2nd picture. Your strong hand should have a firm hand shake type grip not too tight, not too loose. Your support hand is where you need to clamp down, the grip is similar to how you would squeeze a tennis ball. This means all the pressure in your grip comes from your palms and fingers, not from your thumbs. Your support hand palm should be on the grip of the pistol and not on your strong hand. Your index finger is also one of your strongest fingers and is worthless when you put it up on the trigger guard. Having your index finger on the trigger guard will usually cause the shooter to push or pull their shots meaning they go either left or right of the target. I hope this helps.