I'd like you to get some encouragement for your efforts. You're right in showing us that there are more colors in nature than just the super bright reds and yellows and greens of flowers (come to think of it, I've never seen a green flower petel--now that would be worth a picture). Sometimes nature is muted such as this scene.
In the interest of encouraging you to keep trying to improve your craft, I offer the following suggestions. Focus is critical. I'm sorry that I don't know enough about your camera model to advise what to do on the camera, but in general, putting cameras on tripods helps a lot. Then if you can use the smallest aperture (oddly, the largest f/stop number, like f/22), that really helps stretch the field of focus. Lastly, if you have a way to use something like unsharp mask in a photo manipulation program, that may help. Also, it's okay to throw up your hands and try an image with photographic filters offered by programs such as photoshop. Sometimes those results are interesting.
Keep trying. It's great to see non-standard works presented. You might not always get a comment, but it's not going to hurt in the long run, and you just might hear something that helps in the future.