Photoshop Manga Effect Plugin allows you to emulate the abstract effects and general feel of Japanese manga in your Photoshop art. It can alter the width of your lines so as to emulate either a technical pen or a dip pen, and comes with a library of stylistic effects of the sort commonly found in manga: speedlines, flash effects, mist, sunbeams and more. This can be adjusted so as to achieve the effect you are hoping for.