I installed/tested this out on a Samsung Galaxy S23 Ultra. UI was clean and worked well, I tried several different photos and experimented with different slider settings. Some I think were just too dark and didn't end up making ideal coloring pages, but a couple turned out well:
I think the results from the doll exhibit are pretty impressive with all the details that were preserved, especially the patterns on the little dresses. If you want any more info about the device, let me know. My kids also have Samsung tablets and would probably be willing to test this out if you wanted to know how it worked on a larger screen.