Hmm, for the majority of the time i'd have him with glasses on but having them removable would be cool. Maybe a little indentation in his nose which would help them stay on would be an idea?
If it is possible to do the glasses and you don't mind, i'd supply them with the head and let the person do whatever they want with them!
i'm actually finished with cobb (the narrowed nose edits, yes!)
slowly getting there:
slowly getting there: