When rounding the windward mark, steer by heeling to windward and moving your weight aft. Ideally you should execute the turn without using any tiller movement.
What? Is that Tillerman actually getting something right on Day 1 of the Newport Laser frostbiting season? Well, judging by the telltales he should have eased the sheet more, but even so it's not too bad for an old geezer.
OK. Now all you armchair critics can pile in and tell me what else I am doing wrong.