In order to create height in this design we've started our flower placement with three stems of liatris or blazing star. Liatris is a great flower to use to achieve linear effects. Three are placed to create a staggered effect, almost working them down in a steplike arrangment. Note how tall we are coming. Don't be shy in this area.
Height adds to the importance of the design.
Let's achieve the overall shape of this design. Taking several more liatris, place them coming down towards the left side of the arrangement. Although it is hard to see the the photograph, one liatris is being placed in front of the other. Three more liatris are placed at the base line, extending the design off to the left. The design needs weight to balance it on the right.