Copic colors for the Nami x Rarity pair up as Rarity creates a formal gown for the Strawhat Navigator. With the dress adorned with diamonds and sapphires, Nami would not be one to turn down Rarity’s generosity.
 
Copic process:  

 
Line Art
 

 
Base Colors
 

 
Rarity shadows and details
 

 
Nami’s hair and dress (part 1)
 

 
Nami’s Dress (part 2)
 

 
highlights on Rarity’s hair and light background
 
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Rarity of MLP:FIM @Hasbro and Lauren Faust [link]  
Nami of One Piece @Eiichro Oda