How can I make snake skin are something scale turn into armor type of metal?

Well.... if it were snake skin or anything with scales, you could use an action (do a search on free Photoshop Actions)that create a metalic look on each individual scale.... or you could use a filter like Eye Candy Chrome to make the scales look metallic or go to the FARP website I believe there is a tutorial there on painting metal (there may even be one here LOL havent looked) With any of these methods though I really reccomend working on the scales individually, most filters will wipe out something like scales when applied, just keep your lighting all going the same direction and it should turn out nice looking. Hope that was helpful

the trick of making metals is that matals reflect its surrounding. So mask the area of the snake and put a map of a sky or something else. just a thought...*)

I think that you had better ask a better question... something like "I would like to have a metalic effect for snake skin". when I first read your question is seemed to me that it was taken from the perspective of a 3-D app and not within a 2D world. the best answer is to approach the issue like it truely is you have to use traditional techniques to get such effects all chrome and metalic effects are based upon reflectivity and the assumption of a enviroment within the 2D medium. either way its not anything like a 3 D approach. you'll have to create it from scatch. Welcome to the world of art.