These are concepts for the action MMO Global Agenda, done in a range of styles for different situations. I see concepting as primarily a communication tool, and as a finite resource in a production pipeline. When I produce a concept I keep its purpose in mind. Is it to sell a style to non-artists or get a greenlight from a publishing partner? If so then a polished illustration may be needed. Is the goal is to communicate an idea to an LD for a quick blockout? Then a line drawing or even a sketch on a post-it may suffice.