Well, there you have it! Contrast looks great so far. To try this:
1) simply right click on the pic of your rough draft
2) click on "edit"
3) click on "image"
4) click on "invert colors"
and Ta Da......you can find out if you're in sync with contrast. Make sure it is well balanced between dks and lts.
Here are some tips:
1) create some depth with your flowers by adding dk pcs wherever you want
2) use your largest floral pc. as the focal point of your arrangement; then build your arrangement around that flower
3) light fabrics look best around the perimeter of your mini so keep this in mind for getting all those dk pcs to show up.
Here's a pic of the depth created with the flowers: