For some reason, I can't grasp the concept of sketching with paint. There's something about issuing certain strokes of paint to get out a nice rough/ concept, whether it be a character or a landscape. It has a lot to do with value, I know, but there is also brush choices. I mainly use either Painter or Photoshop, and with both, I never get the result I desire.
Example of what I'm trying to do: http://cghub.com/images/view/83562/
Any tips are welcomed.