How I find these

This one is an example of how I often find these works.  The online reseller just took a phone picture and posted it on a website.  Perhaps they are selling the frame along with the painting?

Sometimes I crop and clean these up a bit.  This time I didn't.

This may be an example of a modern painting done in the academic style.

That actually became a "thing" in the mid-20th Century art world.