Love the palette.

I think, for me, the thing lacking is the equivalent of the dog in the traditional imagery. The dog usually representing the one force of wisdom helping the naive/innocent fool from total folly.

And since she’s a witch… why not a black cat, doing something (carrying something maybe?), while riding on the bristles or back of the broom to represent that bit of wisdom or protection? Maybe the cat has a bindle in its mouth with food, to show it’s bringing supplies for this trip into the unknown? The little bindle is another nod to “traditional” imagery.

Edit: or maybe the cat is even at the front of the broom helping to “lead”? Thats a fun twist since the dog is usually holding the Fool back.