Once I get to the middle of the bouquet, the rose is going to be very open, shorter and sticks directly out towards the front. This is the focal center of the bouquet.
Again, I can see more open spaces that need to be filled with roses. Fill in your design evenly, counting roses as you go so you don't put too many into each bouquet.
I put a few roses a little farther to the back and extend it a little longer to follow the curve of the lily grass.
I'm please at the overall effect of the roses and the greenery.
You can see what I mean by finding the center of your bouquet and working in an outward pattern from it to all parts of your bouquet design.