now that the challenge is over and I can see whose image this is, I can be sure that your choice to make the image 550 pixels tall (instead of 640) was a deliberate choice rather than the oversight of one unfamiliar with the customs of DPC. from that standpoint, I still wonder why you chose the smaller size. Was the image just too information-heavy to keep at the full 640?
this is an awesome picture - the colors are lovely and the well-defined stalks of grass are eye-catching. i think a 4x5 crop might have suited this image better - here the red flowers are a bit to small to really anchor the composition. cutting off some of the space at the top would tighten up the image nicely. also - use the full 640 pixels!
Love the simplicity of this - bumping it up on my second run through. Composition is great with the location of the poppies - maybe would like to see the red pop a bit more.