The last two cakes I've made I have been working on my Gerbera Daisies and I think that I finally figured it out. The next time I make them it will be perfect!!
This is the first attempt, I was going for Gerbera's and also Zinnia's. I think it was passable but there were a few things I wasn't thrilled about. The dusting powder I put on was too thick and took away from the flower, also the icing wasn't as smooth as it needed to be.
This is the second. I used a #104 tip.
To start I took a drinking glass and lightly used it to make perfect circle indentations on the cake. Then I took the #104 tip and started from the outside and placing the icing bag at a 45 degree angle and brought it into the center. The first cake I started from the center and was frustrated with how the outside edges turned out. After I finished the petal color I just filled in the center with a contrasting color. Next time I would use a small star tip and use it multiple times to fill in the center. I still love the effect that it had and thought it was beautiful!