The placement of the flower is good, but there is a lot of other detail in the shot that seems to competing for attention. What looks like the petal of another flower on the right is a little distracting. Getting closer to the flower and filling the frame with it would have been ideal, especially if your camera is unable to control the depth of field and put the branches/leaves out of focus more.
That pink, thin border within the image plane is really distracting. The image itself is rather poor in terms of technical quality. The bud is very overexposed, washing out all the details that make close-ups of flowers beautiful; the texture of the petals (you need to almost be able to 'feel' the silkiness of the petals), the translucent color from light shining through the petals, the subtle variations in color (in this case from deep pink to nearly white), and the separateness of the individual petals in relation to the overal form of the flower. In this instance, the bud is so overexposed that the petals blend into each other nearly invisibly creating a blob of white, losing all the qualities I just mentioned.
In terms of composition, you need to get much closer to such a small, delicate flower, isolating it from a visually overwhelming background. The overexposure was likely due to your camera's meter adjusting for the dark background rather than the pale bud. Tighter framing will help in this case also. If your camera allows for manual shutter speed or aperature settings, you can try using a large aperature with a fast shutter speed (the large aperature to create shallow depth of field, the fast shutter speed to make up for the extra light that the larger aperature will let in).
I think the best advise here is to tell you to look for the best bloom of the bunch and be sure there aren't any dark (rust) areas that would distract from the flower. Also the flower on the right is a distraction to the shot, pulling the eye from your main subject.