With a body like that, there’s no doubt she’s a queen…

Hmm Technically, if one takes as a reference how the pieces are in chess, I would say that she would be a rook instead of a queen, although that doesn't take away the fact that this female OC still has a great design overall. Leaving that aside, and regardless that her thigh muscles look kind of... odd, I must to say that she still looks (really) THICC, (very) firm, cute, (very?) sexy, (really) gorgeous, weird (in a good way), in (very) good shape, (very) stunning and... cool; good work by the way. <3

She’s a queen no matter what piece she is…

Considering how her crown looks, as well as her outfit, I'd say not so much, but if you want to see her as a queen, that's fine by me; have a nice day. :3

Maybe she took a rook to wear as her crown?

...Hmm, probably. But taking into account how her outfit looks like, plus the fact that her body is made of stone, I would say, with the utmost respect, that the answer is no. Sorry.

Queen of the castle? More like queen of THICCness.

Queen of thiccness