It's beautiful, but strikes me as odd for a first birthday cake!
Sorry, no input for the design.
i would pipe that
I would form the body out of RKT and then pipe the colors. One thing you don't want is the child to choke on a circle of fondant and with all the bright colors the baby's tongue, lips and fingers will be stained. What are they thinking?? Not a good idea at all.
Have you considered buttercream figure piping. You can make 3D elements with a stiff crusting BC. Here is a Roland Winbeckler video on making a BC frog, but you could apply the same technique to the body of the peacock.