I did what rsaun did, using a toothpick and my hands pretty much! Here's a picture, http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=215193
There's a couple other cakes too, but all use the same type eagle, so if you want to look them up, feel free.
Using a copier to blow up the eagle medal (it was on the front of the invitation) to the size I needed is what helped me. I think I even put one under my clear fondant mat while I worked to make sure I didn't change the size/shape of it while I was doing the detail work. I had another one cut out and loose to use for reference. Once it was a couple days dry I painted it w/ lemon extract and Nu-silver luster dust.
Hope that helps!