the composition is nice, and i beleive the direction of the light is also good, but i feel it is overall too dark, and that the shadow in the alcove itself could have benefited from a reflector of some sory to not hite the botle (or whatever it is) completly.. it's hard for me to tell whats a shadow and what isnt..
I think this shot has potential, I think that you loose the bottle into the shadow a bit too much.... maybe if you could see a little more of the light between the bottle and the shadow cast by the alcove.... not sure..... could maybe have made it a little lighter or more contrasty to bring out the whites a little more.... it just doesn't quite work for me but I am not sure exactly what it is that doesn't work for me... helpful? probably not! IT's on the verge of a good shot and composition in my opinion...... good luck, Todd.