What makes a great photo?

I think a great photo consists of different shapes and lines but not too much. A great photo also need to have light. The photo also has to be creative and original and not like any other pictures. I like pictures with different colors and different shapes. A great picture should have a foreground and background. But the background shouldn't be overcrowded and there should be a focus that she want the picture to portray. It should also be interesting and moments that are hard to find.