Would you be alright doing a character that her own type and theme of floating shields for this piece?

Does this require an existing character with references, or can it be for a new character working off of text and an image collage?

There is an almost perfect duplicate of this another user has put up for auction? https://ych.commishes.com/auction/show/HHSQ/-ych-/

There is an almost perfect duplicate of this another user has put up for auction? https://ych.commishes.com/auction/show/HHSN/-ych-/