Compositionally, I really like this, and the way you have used the negative space. The line draws your eyes down and through the frame to the pins. The only suggestion for composition I would have is if a bit more of the far right clip was included, OR if you had cropped it on the bottom so that it was "overflowing" two sides of the shot.
Technically, the colors are very good here and the exposure is good. I'm impressed that you can still see the texture of the string. That said, a bit more contrast or levels adjustment to make it just a shade darker, might make the pins a bit bolder, and therefore make the shot a bit stronger.
Nice angle on the clothesline which fits the challenge well, though you sometimes hear a downward line has a negative connotation while an upward line (left to right) has a more positive connotation. The right clothespin (peg if you're from the other side of the ocean) is clipped off. I'd shift over or move the peg to the other side of the others. It all looks a bit out of focus, though it may be the texture of the line making it look that way.