i like the composition of the windmill here, its nice to see a close up bit of it, rather than the whole thing, i like how its half painted and half brick and how you set that up in the shot too! the tower is also interesting however, im not sure it adds anything or not to the image although its nice to see, i think the composition and placement of the mill is strong enough to be on its own. (thats my two penneth heheheh)
Like how you have make some depth in this image by putting the tower in the background:)