Try maybe exporting to an auto-image tracer such as Corel Draw or Xara X. It's not perfect, but it's not bad. I think thats how your example was done. It's a vector, not a bitmap. An alternative quick outline function in PS is to copy the layer, and apply smart blur (edges only), then using overlay mode, set it to about 60-70% opacity. Again, not amazing, but far better than all those crap "define edges" filters.