Ron, very good. I second what Russell says about the neat way you spin the handle in your hand after the crack.
Russell, that's good too - though you can probably learn to use less energy, and so make it more elegant.
Again, it's hard to see, but both of you appear to hold the handle at an angle from your body. What I mean is this: Imagine someone looking at you from above. Imagine a clock face flat on the ground. The handle of the whip seems to point to about 2 o'clock, rather than 12 o'clock. One's natural instinct is to do this, to avoid contact with the thong as it swings around; but you should be able to keep the vertical plane of the whip's arc (against the vertical imaginary clock face) absolutely flat.
Russell, I must say (once again) that your dog seems to be enjoying this hugely!)
Ron, can that be a yellow rose behind you? In March? Or is it some kind of 'Texas' plant?
'Less is often more!'