Subdividing your mesh to get a more detailed canvas on which to do your vertex painting.

Related posts:

  1. Basic Vertex Painting
  2. Multiple Vertex Groups in Blender (8 of 8)
  3. Convert Meta Shape to Mesh
  4. Creating a Vertex Group in Blender (7 of 8)
  5. Adding an Armature to a Mesh in Blender (1 of 2)