"Is that picture using a standard PS filter?" Which picture do you mean? If you mean the one I linked to, yes, it is, in passes. There was a point in my life where I took pride in using nothing but Photoshop's standard filters to achieve effects (mostly because I didn't have any plug-ins). The graphic pen filter was used several times, sometimes with the option of slanting right and other times with the option of slanting left. I think I also used the find outlines filter and desaturated the result. This is all after using the posterize feature. These passes were done to different copies of the image on separate layers, and the layers were set to multiply. After everything I did, I made sure to flatten the image, convert everything to grayscale, then to bitmap mode. Worked like a charm.