The finger snap fire spark and hip thrust were the only good elements about it. The forearm shots and the calf shots were boring stylistically, and the calf shots were a repetition of what they did for the forearm shots adding to that. Toei should have just mimic Cure Rouge's from GoGo and kept it short and simple and not worry about adhering to a transformation formula, which they did with the redundant calf shots. The explosion was also bad and its placement was even worse. It looked like Sunny was farting it after the hair transformation, and the flair of the explosion was a whimper because the impact of it is diminished with the angle they've chosen when it would have been better to zoom out while it was happening or shot farther in general. The transformation in general has lots of color but a boring style that isn't far off from how March's was.
The leg shots and arm shots are rather standard, but the snap, as you said, and hip thrust are both elements that have no equal in Peace's transformation. The explosion is fine, it's just the background element for Sunny's transformation, not part of the actual transformation itself - just like the blue and red flowers for Marine and Blossom in Heartcatch. Sunny's hair change is better than any of the others, since it uses fire, while the others simply use a glowing white blob to transform their hair. Peace's best element is the rock-paper-scissors element, but as the rest of her transformation is so boring, with the same leg - arm - chest shot that all the other girls have, it's not good enough to overtake Sunny's.