Hi all, I wanted to "advertise" a free and open-source program I wrote to help with the drawing stage of paintings. To use it, you point a webcam at your painting and load a reference image onto the computer. The program lets you semi-transparently overlay the reference on top of the webcam video of the canvas.
I made a demo video here:
And here is a download link: https://salelder.com/vermeer/
Again, it's totally free and open-source. I hope somebody finds it useful, and I'd be glad to read any suggestions for improvements!