Best pic of a good Westie head (per my groom school teacher years ago) is the Ceaser's wet dog food in the small plastic square. Not sure if it's still sold.
Cold Hands Warm Heart: Perfect Dog Bows (Tip from a Professional Dog Groomer)
Giant Schnauzer grooming guide - Clip the side of the head
Dog Grooming Information :: Breed Grooming Profile
Grooming Kerry blue terrier
Perro Gato Higiene Tijeras 8.5 Profesional 6.5 Pelo Quitavolumen Cizallas