Position: Be aware and decide

It starts with awareness. Left thumb up or back? Right elbow high, medium or low? Left hand fingers on the very tip or fingers more curved? Bow hand little finger curved or not? Bow pressure from the fingers, hand, arm or combination? All of these change the way you play and sound. Great players play in different ways. But great players are aware of what they are doing physically (and musically too, of course) and why they have chosen to do it. Be aware. Don't default to a position about which you are unaware.