Neat! That actually really cool! Could you add silhouettes of the other Diamonds? (The light radiating from Rainbow is good to stay, it can just shine over the other characters transparently if possible.) Like Yellow and Blue in the upper left and Pink with her back turned, arms crossed, and looking over her shoulder with one eye visible in the upper right.
Can you also make Rose Quartz stand under Pink in her shadow with her eyes downcast and the Crystal Gems + Steven stand in a group in the mid left?
Steven should have eyes that are mostly black but have a Peach/Coral shine make his diamond pupils visible and kind of glowing like this image, but maybe not as intensely.
https://static.wikia.nocookie.net/mlp/images/e/eb/Rainbow_glow_on_Rarity%27s_iris_S4E08.png/revision/latest?cb=20140106165045
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTTXIZKMUJihIE31gU4wY8ZfGOdvPu6R6PIDijiuRRAyQ&s=10
While Steven's hair should have highlights in Peach colors like in this image.
https://i.pinimg.com/736x/03/ec/d0/03ecd0b7537a52c34849f0a5414e26bb.jpg
Steven should look confused and a little nervous but friendly, Garnet should have her gauntlets raised for a fight, Pearl should have her hands over her mouth, and Amethyst should be holding her wipe looking scared but ready to fight.
[If that's all too much just let me know.]
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