Nothing wrong with the technique, or the colors - but I think you'd like it better if there was more variance to the color value - meaning light to dark. If you convert the photo to black and white you'll see that most of your fabric selections will be the same grey tone (same "value). The only one that is different is the dark green on the left side of the bud.
Try another with more definition to the lights and darks and I think you'll like it just fine!!
Nice job!