Hi Daisy, welcome! 
I think this was already explored a bit more over in the other full moon discussion ( Is Tonight The Worm Moon? ), but just wanted to add that I also use the 3~ days guideline when it comes to the full moon. Once the moon is within a few percentage degrees of fullness (I’d say 97% for me personally, but others wait until 98 or 99%) the moon appears full to the naked eye and is ripe for full moon magic.
That being said, it really is all about how you perceive it - there’s nothing wrong with diving in to full moon magic when the moon is at 98% full, and there’s nothing wrong with waiting until the exact moment of peak illumination either! To each witch their own 
Gorgeous pictures, Kirsty - the moon is so beautiful, and I love how you caught the bird mid-flight too! 
Thank you for sharing - blessed full moon!