Start by soaking the foam ring, place foam side down onto the water and let it soak naturally. Do not push the foam ring down into the water as this will cause air pockets which will not soak properly.

You will need to add the foliage first to create the shape and size of the design.  

Next add in the focal flowers, this will be the roses/Chrysanthemum blooms.

Add in the Asiatic lillies next, in between the focal flowers.

Use the Carthamus and Chrysanthemum spray code green to define the shape and add texture.

Finish with the Thlaspi green bell and any left over foliage you may have to fill any gaps.