Even though the use of colors, light and composion is nice here, I'm hardly pushed to believe this thing isnt' electronical. For composition I'd like you to reconsider if you feel the big wheel with smaller wheel at the closer end of the Singer is the most important part. Now it's greatness, inherent constrasty and location in frame all emphasises it's meaning. I also believe it was your decision to use such a short focal length, but maybe you could reconsider longer now.
This is an "almost" shot. I think it is on the verge of great. The spools of thread are great, the angle is ok, the background is distracting and it needs a bit more even lighting. But, the subject matter and composition are very good. For the background, a white sheet would work great, since it is OOF because of the shallow DOF.