Ya well done Storm, you're gettin' there. [righton]
Don't be afraid to "grunge" up your stuff though. Adds character.
Doesn't HAVE to be to the extreme... a little goes a long way.
Wanted to mention too that when doing those scratches, dings, & dents... don't make the lines completely dark. It hides the 'depth' effect needed.
Try those this way:
On a new layer above the body parts, paint with a 1 pixel brush the scratches you want.
Apply the Stroke filter (FILTER>Stylize>Emboss) at 1 and 500%. Lighting at whatever direction matches your iFace's current lighting setup.
Set the layer to either Overlay or Softlight. Overlay is bold, Softlight is subtle.
You'll find that this method produces the best looking and most consistent looking effect.
For dents and stuff, just use a larger brush size. :B