I like your idea very much. I wish your depth of field were deeper...the blurry foreground pins are a bit of a distraction. Otherwise, I like the simplicity of your composition.
Hmmm. there are no TACKS in this image! ;) Like the red ones hat. Reminds me of me. Except I hate pink and wouldn't be caught dead in a pink hat. Such is life. I like where you were going here. I think it may have worked a little better with a less harsh background. The yellow tacks also seem a little harsh but I think thats due to the white being so strong. 7 for originality and a decent macro.
The empty space on either side of the row of tacks seems odd. I think that this might have worked better if the row stretched past the edge of the frame.