Close-ups of flowers require careful attention to composition. Use live view to determine the area of the frame that is in focus. For more precise focus, zoom in on the view through the lens. Care is also required to prevent blur: not only will a tripod come in handy, but depending on shooting conditions you may also benefit from mirror-up mode or an optional wireless remote control.
The soft filter effect option in the camera retouch menu can be used to add a dreamy effect.