Here's the secret to becoming a good caster: practice. And really good casters practice more. Getting lessons from time to time is going to help of course - even world champions have coaches - in fact they have the best coaches. But buying a video camera is perhaps the single most significant purchase you can make. And will you catch more fish? You bet.
P.s. this could be one of Lefty's 5 principles in action. Oh, and notice the thumb - that's an advanced hauling trick. And the bald head of course: that's the whiplash effect.