an older, somewhat lazy twaalf pic that i decided to re-render and share; it was originally from some random-ass RP existence. also recaching the softbody dynamics took 40 god damn minutes for a 77 frames-long timeline lmao

also some spontaneous existence lmao; read if you wanna:
so i imagined twaalf's skirt being the portal to a simple demi-plane, where the contents of her skirt are actually just hyper-simplified (of an already rather-simple scene) objects in a scene to look more like a tri-tone decoration upon the fabrics, and the "inside" of the skirt is a proper bouncy castle. Whenever twaalf's skirt becomes or assumed the shape of a very rounded and puffy object (like it's draped over a bubble or something similarly round and large enough), the chances of phasing through her skirt is raised substantially to a feasible point.
in the case you do fall through her skirt (you'll know if you suddenly feel no resistance or anything solid below the skirt's surface), you'd end up in a large 100 meter-in-radius bouncy-castle place, where the center of the zone is where the skirt's decoration actually comes from. And thanks to the skirt already having its form given permanence (for the design), the skirt's design won't change if you alter anything in the demiplane, and even if the demiplane were lost, the skirt's decorations won't change.
the ground is a repeating lightly-bulged rubbery radial tile (that points inwards and slightly upwards in an incline), with plentiful bits of rubbery grass beds and puffy-balloony bushes scattered throughout the land. As you get closer to the top of the hill, trees (and more and more of those trees) are seen, and at the very top, a couple copies of the creature is also seen.
further more, the wall of the demiplane is (just like the ground, trees, and beak-thing print) squishy, elastic, and bouncy. In a special case, the walls have a projected view of what is seen on the "outside", projected somewhat accurately from a "disc" to a dome-shape (properly following the skirt's shape), and it's properly clear and accurate when seen within 20ft of the wall, and it progressively gets blurry (and slower-moving) as you move away from it; about 120ft and beyond, they're just very slowly meshing hues (assume like a lava-lamp kinda thing.