Good discipline on using the self-timer to trigger the tri-pod shot. I'm never sure what to do with my hands either - prancing about seems somehow out of place.

What kind of surface are you reflected in? Is that a mirror, or some extremely polished granite? There's so much grain that it could be either.

The composition is good - the sign and door handle are an odd addition.

I've pondered about what to say about this one. There's lots of things I would have tried at this location. What you've come up with seems stark and cold, much like someone lining up for a mug shot at the police station. I like that very much about it, gives me a feeling that the place is cold and sterile. Centering the subject works for me, although I'm not sure if I would have left 3 sides of the photograph with something cut off. You might try cropping off the think on the left or possibly the door on the right and see if that makes a different feeling to it. Excellent choice for a submission.