Apropos inspiration (see also the previous post): I was truly fascinated by this eagle's "beak job". This greatly inspired my way of designing beaks with character, as you can see here from the samples below.
Eagle photos via WebEcoist (Photos © by their respective owners)
Oh, by the by, if you're in the New York City area I encourage you to stop in The Village Petstore And Charcoal Grill, 7th Avenue South. Here's one of my favorite pets from there (besides the hot dogs, of course):