A think it's a great concept. I like the use of the dark negative space. And the composition nice, with the light spill leading you to the subject.
I think the visual clutter inside the door distracts and weakens the image. The problem is that in terms of tone your eye sees light>dark>light>dark moving from left to right, and the clutter creates a mixed point of interest. And I think that you could strengthen the composition by removing the some of the area above the door, either with a crop or a different angle.