Here's a landscape. Took about two hours in Painter and Photoshop. It was looking terrible until I brought it into Photoshop and started overlaying a bunch of crap onto it. Adjustment layers and Overlay layers are the key to this digital stuff.
In Painter it was just a bit too smooth. I had to bring it into Photoshop to add the texture and those brushstrokes. Painter can do some really nice stuff with simulating natural media, but I just don't know it as well as Photoshop. I probably just need to find a brush I like, and use it until it makes sense.