The picture has some potential, but need a little bit work on it.
The wall, columns and floor are to bright and blown out. Try to darken them and try to recover the blown out higlights.
The wall you are looking at is too dark and should be lightne up.
The ceiling, directly on the top of the picture is a little bit too dark and could be lighten up
Finally you could streigthen up the picture so that the floor is streight instead of leaning to the left.
You could also try and do a B&W conversion.