The snakes have a very hard to see scaley texture. I outlined it all in black and then went over with some watery gold and silver and then more black for the shading. The scales show through as a texture more than color.
Taking pictures is a good way to get a view from a distance and I'd never have noticed the head of the silver snake as off without it.
Because the creatures were done practically and without cgi they actually hold up after all this time. I've seen some 80s movies where the special effects look like someone overlaid a cartoon laser or whatever they were trying to do.