I think that comes with maturity.
Puppies can't sit still no matter
how much you want them to.
I didn't start taking pictures of Buddy much until after I found YT.
He was 1yr old so perhaps around that time you will have better luck.
He sees the camera and just poses.
You can put him in any position
and say STAY and he does. Be patient, one day you'll be beaming
and showing off your baby instead of a blur.