Dustin Nguyen uses a combination of traditional and digital techniques in his work, most commonly airbrush, brush and ink, and in this particular case watercolors.
He employs a list of artistic methods and elements into what many would consider the childrens market of superhero comic books and manages to produce work that is both rich in detail and color, the use of watercolors for the stained glass window design work perfectly and he lets the watercolor do its own thing in the stone wall detail but still manages to control the medium and produce a tight piece with a wealth of detail and style. His style lends itself to the series that he pencils and he brings a dark and somber image of gotham and batman, the main series he works for, all the while maintaining some playfulness to his work proving that he is capable of being a diverse artist.
While his cover art is fairly straight forward in terms of layout and presentation, his pencils inside the book draw heavily from film noir and set a dark and mysterious tone, some of it probably having to do with the subject matter. It would be great to let him step out from behind the bat and explore other subjects to see what hes truly capable of.