Please give your advice on the composition for still life on say, flowers...Say in situations like flower arrangement exhibition with no external beautifying lighting to express a particular flower pot...

Focal length: 62.0mm (35mm equivalent: 378mm)
CCD width: 5.91mm
Exposure time: 0.020 s (1/50)
Aperture: f/7.1
ISO equiv.: 3200
Jpeg process: Baseline

Thanks!! Appreciate!