surely that's a recipe for landing left wheel first? how many of us can hold the wings perfectly level while sticking our head all the way to one side?
For the flare i'm always looking at the far end of the runway, and then (if there is one) the fence, if i can see over the fence i'm too high!
Look to the end of the runway judge with your peripheral vision when to flare... its all about feeling, you'll know when you are too high or too fast, the trick is what to do about it!
but the instructor sounds a bit odd...... talk to the CFI especially if he is being painful in signing you off.