Milestone's / Payments.
We divide the project in 2 milestones that is 50% cost of the project as first milestone , and 50% as 2nd and final milestone, Please remember that milestone is an amount which you don't have to release, it stays with the freelancer/elance team,its neither with you and nor with me, its like money with the 3rd party. You have to only release the milestone once we achieve it
1st milestone After sketched storyboard and completion of all the graphics
2nd milestone After completion of video.