Well you definitely shot an image which concentrates its emphasis on a thirds point, however as it is this image is a bit uninteresting. I think if you had moved the jar to the right side, so the full shadow is included in the image it would have been a bit more dynamic. Also the bit of grass in the background distract, cropping to remove that would help. Good for you entering anyway and I wish you luck with future entries.
Sorry but since you were already cropping this shot, why leave in the pole in the upper left corner? Also I would have preferred it had the shadow of the bottle been in the shot, I think a step to the left would have eliminated that pole and kept the shadow, what do you think?
For me, this photo is just too much of the same thing - two colors (back wall & jar lid brown and asphalt and jar/contents grey). The composition is good. It is an interesting picture, but not one you'd want to look at again and again - if that makes any sense.