Your file size is only 54k when you could have used up to 150k. This indicates a lot of JPEG compression, which is taking a lot of detail and clarity out of your photo. Check the JPEG compression settings in your image editor and always try to save as close to the limit for a challenge as you can get it without going over.
not sure what kind of camera you're using, but i think more light would help in reducing the noise of the image. focus also seems to be off. if it was me, i'd aim for the center of the right flower for focus.