Composition - With no details on this photo, its difficult to say what exactly you were going for here. I'm guessing you were going for some geometry in lines in lieu of a definite object as a subject. The shadows are pretty good here. I like the darkness in the top left and bottom right corner. The shadows on the rest of the door are pretty good too. I think it would've been conducive to show more of the door, unless there was something there we weren't supposed to see. There isn't a real compelling "subject" here though. The shadows are okay, but the seem like leading lines leading to something somewhere, we just don't know what or where.
Technical - You have the interesting lighting aspect of this and actually the framing isn't too bad. I rather like it except for its a little tight. The focus is good and DOF isn't really an issue in this pic. There is no obvious post processing which is good.
Overall - Its not a bad photo, but there seems to be nothing really compelling about this shot, no "wow" factor. Interesting yes, but not much else. I think you did a good job for what it is, but I wish something else was going on here. Sorry I couldn't be much help. Good luck in future challenges - Inspzil
Nice lighting and strong contrast make this an enjoyable photo to look at. There is a bit of distortion on the bottom right. Having the lines placed perfectly horizontal and vertical may have improved the strength of the picture, and enforced the already strong contrast. Doing that gives less of a homely feeling and that might not be preferred. Nice Photo.