The Stan Winston School offers classes out in California for a number of crafts. Stan Winston Studios is, of course, famous for many of its movie creatures and animatronics, such as the Terminators, the dinosaurs in Jurassic Park, the aliens from Alien, and many more. The classes they offer fit their specialties, such as sculpting, creature design, large-scale puppetry, painting and so on.
For those who can’t afford to head out to California and attend monster-making school, they have hours and hours of videos on their website. They offer a number of options for viewing the videos; everything from subscribing for a year of unlimited video watching ($300) to buying a DVD of a single lesson ($40). Previews of all the lessons are available for free viewing so you can check them all out. Below is a pretty fun one of foam fabrication, where Ted Haines constructs a Tyrannosaurus out of upholstery foam.
It seems like a great option to augment your skills since these kinds of classes usually aren’t offered at the local Learning Annex.