I recently undertook a fantasy board game artwork job. I use ArtRage for my concept art sketches because I really like the pencil tool. Here you can see a few images I created with ArtRage.

Click image for larger version.  Name: sketch1.jpg  Views: 961  Size: 113.1 KB  ID: 88688Click image for larger version.  Name: sketch2.jpg  Views: 409  Size: 114.0 KB  ID: 88689Click image for larger version.  Name: sketch3.jpg  Views: 514  Size: 168.3 KB  ID: 88690Click image for larger version.  Name: sketch4.jpg  Views: 449  Size: 158.2 KB  ID: 88691