Is there a rule of thumb for what you use fondant and gumpaste for? I use the gumpaste for the flowers and they set up hard, I know this is correct from the classes I take.
What about the "quill art" type flowers? Should it be fondant so it's more ediable or GP so it holds up better?
Is there a combination of the two that would be better? Things like castle turets and mermaid hair.
I'm so confused. HELP! 
It's really a matter of choice in a lot of cases. Fondant doesn't really set up very firm, so if you want something to hold its shape, you either need to use gumpaste, or add gum tex to your fondant to make it harder. If you're putting something on a cake that you want someone to eat, then you'd use straight fondant.
Also if you're going to be making something that you want to have the chance to re-form or fix, you'll probably want to use fondant, because gumpaste or fondant with gum tex added becomes hard to work with very quickly.
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