I will toss out a few ideas for you to consider.
1. Don't always shoot downward. Get lower so you can shoot straight on, or even upwards if need be.
2. Don't pinch them in so tight. You really don't want petal points touching the edge of the photograph. Or, come in very tight and crop off part of the petals.
3. Consider your b/g very carefully. It's not enough to throw them into diffusion, you have to consider what lines and colors are back there.
4. Generally, very dark b'g is preferred for this.
5. The flowers are more than the bloom, they are the stems and leaves too. You have to take all that into the composition.
Try some more and post them.