Get Your Head Over the Ball
If you have been missing a lot of putts lately, odds are you do not have a proper stance when putting. The stance for a normal golf shot and a putt are much different. The grip is still the same, however, with putting you want your body to be much closer to the ball.
When putting, you should line your body much closer to the ball. The club head should be flat on the ground and square towards the marking point. An easy way to tell if you have the proper stance is to line up for a putt and drop a golf ball directly from the spot between your eyes. The ball you drop should land on top of the ball you are going to putt. From this angle you are less likely to make judgment errors. You can see the back of the ball perfectly.