You can mimic the already implemented and successful program of IFAE.
We begin by selecting a few designers from the community who have basic photoshop skills and image processing knowledge. Ryan uploads a few tutorials on YouTube explaining step by step the process of designing 4K liveries from start to finish. A repository of pending/in works/completed can be made where the chosen volunteers can submit liveries. Ryan supervises the entire process and pushes the submitted liveries which meet the set quality standards.