I've come to find that inking is really tedious and can get very frustrating, very quickly. If you really want to do inking, I highly suggest investing in a program specifically designed for inking, rather than Photoshop, as Photoshop is really poor and terrible for doing that in general - in fact, Photoshop is a nightmare of a art program for most digital illustrative artists. Most people these days have moved onto things like Paint Tool Sai or Corel Painter.