Here are a few ad comps that were part of a series that I rendered for one of my New York clients. They were all 9 x 11" and done using markers on layout paper.
I did the lettering on the computer and pasted it into my layout.
The same method was used on this rendering.
Another marker rendering and the lettering in this case was painted on with a brush.
I also had to do the lettering in different languages as these ads would also be used in foreign markets.