I'm not really that much into tricking but I can give you a couple of tips
1) Watch other people's tricking replays, pay attention to their positions prior to the trick. Getting into position is one of the most important parts of tricking replays
2) Stay on your feet, minimise the amount of time that your hands are touching the floor.
3) While we're on the topic of feet, you want to try to get your entire foot in contact with the floor rather than just your heel; You can achieve this by relaxing or extending your ankles more often
4) Keep your neck joint held, at the moment it's really floppy and distracting