You will produce a wide variety of sketches for a chair that are influenced by the work of the architect that you researched for the first project.
Try and use some different media when doing your initial design ideas.
Here is an example of white on black.
There is also notes on this example which link back to the specific building designed by your architect that was the main influence and what design elements have been used to reflect that influence.
Don't forget to embed the scans of all your design concepts onto your DVC seating project page...