Took a shot of a pile of logs for the letter o.
Didn't crop it, but I used auto level and contrast. A little curve, then in colour balance I +16 cyan-red, +17 magenta-green and +6 yellow-blue. I then went into contrast and put it up to +16 to make the logs darker and more contrast.
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The O is too obvious a letter for me, as it can be found almost anywhere. Circles are common in everyday life. Your DOF is not so good, the background is too important to be out of focus. You need a higher aperture. 4.
Too dark, and grainy for my tastes. It fitts the challeng but I don't find the compoasition to be very flattering to the subject, I think I would have used a slower shutter speed and a bit more flash to make the rings of the tree pop a bit better.
The red line on the log is a bit distracting, although this shot meets the challenge overall it isn't very interesting in my opinion., maybe if there were more contrast or colors in the sky...