those are not lilies. if you Google gerbera you will see the centre they should have. I normally don't do those on wires, as the petals are so thin and they break easily. If you do want them wired though, the best is to start with the centre on a wire, let it dry and then build the petals around it.
your flowers can be used without wires on the side of a cake though, so don't think you have wasted your time. :)