David Browning Several samples of David's illustration work are available for viewing on the portfolio section of this Web site. Techniques vary from pen and ink to brush work combined with Photoshop techniques. David often uses a drawing software program to complete charts, graphs and diagrams. David has also completed several architectural renderings that visualize buildings in the process of construction or document the finished sites. Those renderings are often completed using a combination of pen and ink with marker or watercolor. More detailed images are completed using a guash technique.