oh hun I'd love to help you but for some reason the picture won't show up on my computer so I'll give you a bump
boy howdy i wish i was more help but all i can think of is to write with royal icing and then paint with luster dust.
I have to agree with writing with royal icing. Instead of luster dust you can get silver highlighter from Globalsugarart for a metallic look.
I Can't see the picture either, but I know you can mix silver luster dust with vodka and make a paste and you could paint it on, or maybe you could find some type of non toxic, edible marker to use for it. Good Luck wish I could be more help!
there's a recipe on here on here that's called "Piping gold or silver"
I can't see the picture either. Maybe an airbrush and stencil?
Here's the link to the recipe I was talking about. I haven't tried it yet.
wish I could see the pic... could you try again?