I decided to draw her based on my favorite Selina Camren Bicondova from Gotham with some characteristics from other incarnations.
Her hair is based on Camren’s as are her eyes, but her hair is also related to Michelle Pfeiffer from Batman Returns and also Lili Simmons from the Gotham series finale.
The cowl is from the video game Arkham City.
Her clothes are based on her introductory episode of Batman: The Animated Series as well as issue 10 of the current comic run of Catwoman by Joëlle Jones
Lastly, I really wanted to include something about Selina from DC Super Hero Girls so her diamond necklace was added.