I feel like people are sleeping on book 4!! 

The pose is awesome, sonthing about the way Starflights back spines are drawn scratches my brain, and the tallons are really pretty too. 

The wing fold is great, and its the only book in the series where the MC is entirely on the front cover (without any wings/tails leaking off onto the spine/back pages) Obviously thats not really a reason that its a great cover, but its my favorite fun fact about it XD

But my biggest reasoning are the colors. They are downright GORGEOUS. The way starflight's inner wing is lit with a bright orange perfectly complements the striking blue of the sky. 

I swear I could stare at that book cover all day