Hanging a beautiful piece of art in a dark corner is an injustice to the art and a missed opportunity to show the painting at its best. It would be like going to a party looking drop-dead gorgeous and finding out the venue is a very dark room where you can barely be seen. No one can appreciate how great you look. What a waste!
The best way to light the art is from the ceiling, but that isn’t always possible. You may have very high ceilings or there may be no access to a power source. If that’s the case, another alternative is a picture light. Picture lights are mounted to the back of the frame and light the image.