I have mine printed on metal and they look fabulous. There are multiple online companies that do this. A 10” x 10” metal print costs around $25. Well worth it, and they make fantastic, unique gifts.

There are plenty of ways to do this. A screenshot is one. But for details to come out better when blown up, most tablets or phones have a save as feature or export option. on the Apple products, click on your picture, but don't choose "publish" or "Color." Then look for the box with the up arrow. This allows you to save the image which you can then print or export to other programs for printing. You can even send it to places online where they will print on canvas and such. Good luck.

I'd like to be able to print my pictures and give them to friends and family like I can with a physical coloring book.

Fill your screen with the picture & take a screenshot, save to your photos. Edit & crop screenshot so only picture is visible & re-save. Try printing from there. Should be like printing any other photo or receipt screenshot photo.