You are certainly getting the idea here. Good anticipation and follow through, the weight is fairly good too. I'd listen to the crits above, the head does snap quite a bit at the end and the feet really should be on the ground
As he leaps, I'd leave the feet on the ground for another frame or two - they come up too suddenly making it the leap look a little too effortless. The hands coming to rest at the end look a little off to me, have them snap down some more on the landing and try to avoid mirroring them (as at the moment he looks like he is holding an invisible object)
Good choice of research material btw - Williams's book is very useful.