Outdoors, watch out for the wind (and try to block it from moving the flower, if possible). The slightest movement of the flower subject will be apparent in your image (unless a very high shutter speed is used). However, sometimes a “dreamy blur” of a moving flower can actually enhance the image! Consider using a hand-held reflector (as simple as a piece of white cardboard or gold or silver foil glued to card board) to enhance the lighting (usually from the side of) the flower opposite the main light source. This low-tech device is also handy to use as a small windbreak when held near the subject flower. The best quality of light for flower (and fall foliage) photography is overcast. Sunshine can make the flowers too contrasty and shadows harsh. Under a bright sun, consider using an umbrella or something similar to create shade.