If your goal is to make it "cellular" you can get an even more cellular appearance by using the Delaunay triangle
centroids instead of the circumcenters like Voronoi diagrams use. Side by side comparisons
https://www.redblobgames.com/x/1721-voronoi-alternative/ (scroll halfway down). The polygons end up looking rounder. I also made a little toy where you can drag an image onto the page to fill a cellular polygon diagram
https://www.redblobgames.com/x/1722-delaunay-map-import/ (cartoon images work pretty well but fine detail is lost)