Yeah! And also adding outlines. To make it "pop" from its tile.
Hmm...
I was thinking that if I added a white outline to black pieces, they'd look strange on white squares. The outline contains detail that will be lost on white squares if the outline on black pieces are white.
Whatever suits you to be honest.
Also, forgot to mention this, but your game has a nice concept. Good work on that!
Also Crown Combat has a nice ring to it.
Edit: nice naming 👍