You were very fortunate in that you received many good suggestions via the comments during the challenge.
Your idea was simple, yet effective; it certainly shows rust so it satisfied the challenge.
The exposure looks to be right on - so from a technical point there is only the problem with focus on the left side of the frame. You shot this at f 3.5 - which was probably wide open. To get more in focus (larger depth of field) - you can shoot with the lens stopped down - f16 perhaps - and a slower shutter speed. This may require a tripod or other stabilizing device.
On the artistic side, remember that the viewers eye with go right to the area with the highest contrast - in this case the screw itself. This is good - but since the screw is on the edge of the frame, the eye is allowed to escape! So I'm agreeing with the folks who said the entire screw should have been in the frame.
You should feel pretty good about making it into the top half for your very first submission!
Keep shooting, keep sharing, and best of luck to you.
Composition: Subject Placement, Cropping, Background 5
Technical: Focus, Exposure, Lighting, Processing 7
Appeal: Is it Interesting, Motivating, Etc.? 3
How well does it meet the challenge: 8
Total Averaged Rating 5.75 Dick
Composition: Subject Placement, Cropping, Background 6
Technical: Focus, Exposure, Lighting, Processing 6
Appeal: Is it Interesting, Motivating, Etc. 5
How well does it meet the challenge: 7
Total Averaged Rating(Rounded) 6
This is a good start. I'd prefer to see the whole of it in focus so that you can see the textures. I'd also move it left a little to see the full screw.
For me, the DOF is too tight with the wood out of focus. Also, with "Screw" in the title, maybe it should not have the side chopped off? Good texture on the rusted part though.
Just a little smaller aperture and a complete view of the entire screw, I would really, really like this photo. The rust is really rendered nicely. It does not show up as uniform at all. There is also something lying on the wood that could have been picked off before shooting the shot.