The cropping is a little tight. Looks like the border ate up the extra room to show the points of the two end pins. The border didn't add anything to the presentation of the picture and actually detracts from the composition. Sorry.
Not the most original subject, but the execution of the idea is great! Looks like the lighting is natural, I would think this would be a top of a car and sunlight? Great colors, and "swirling" effect on the row. Good!
can't wait to read how you got the sky in the background, nice touch. I knew there'd be a push-pin entry - yours is well done. To make this shot a bit better: the spacing of the black and white pins could be more like the others as repetition is a element of the shot.