This is the way I've always held my pencil. Until recently I never even thought there was any other way. Good control for detail.
Another common handle, a bit looser.
Try holding the pencil further back. Good for loose, light sketching.
I've been playing with this one a lot lately. Most of the motion is with the arm. Nice and loose. Much more comfortable when I hold my sketch book vertical.
Sometimes the pencil just doesn't want to cooperate and you need to let it know who's boss.