Another way of producing concept ideas particularly when dealing with actual locations is to paint over photos. This will probably be useful for when visualising set dressing rather than set build. It allows visualisation of a mood, alterations of lighting and might be useful for the designer who wants to guide design at the post production phase. I see that I will use this technique for some of my location choices around London that are not going to feature in my main model/design. Once I get the hang of digital painting it should be fairly straight forward to produce concepts.
Again, these are just rough images showing what can be done. I will spend a lot more time on my chosen locations when I have my photos next week.
The bottom image is some digital painting with various filters to change sections of the buildings.