I have another stem of orange - but this is the smaller headed spray roses.
I inserted it into the right side, balancing out the shorter stem with the other orange flowers in the arrangement.
Another look from the top.
I want the orange spray roses to come out with a curve downwards from the side.
See how the spray rose stems insert into the existing stems help round out the color balance and give interest with mixing smaller heads in the with larger heads.
A side view gives it a good perspective of how the arrangement is building. Placing the orange spray roses on both sides gives balance.