Pupils are black, irises are different colors. The problem with doing this technique though is you lose that little spot of light (reflection) that all pupils have. It is very obvious when someone...

I teach classes, but they are just 1 day classes that comprise 7 hours of a subject. There are 5 levels of photoshop that each are 7 hours long. For other subjects there might only be 2 or 3 classes....