European Roller

Picture of an European Roller taken right outside Ndutu, Serengeti National Park. Up until recently, I thought this was an immature Abyssinian Roller, which can look almost identical to the Europen Roller except for few minor details in color patches, but after looking at several pictures I took at that moment from different angles and comparing them with my field guide book, it eventually came clear that it was an European Roller.
Any comments or critiques appreciated.
Thanks,

Cesar.