There are many very talented artists who make their uncolored images available to the community, but it's not easy to get them. I have to select share, and email the link to myself. Then I have to click on the link to open the page, right click to save it, then import it into Photos and finally import it into Pigment.

Why not add a checkmark option to any image. If the artist has checked an image, you then have the option to add to your library for coloring.