Ok been trying to learn the whole shading/texturing thing since that is my biggest challenge. However as I have been playing around texturing different models I'm making I've found this strange problem on some models.

I'm not quite sure how to explain it, but they look like little shadows here and there. They like break apart the faces in a diagnal fashion. I thought it might be something with the normals but I've played with a couple of the functions that adjust normals. But no difference. Here's a screenshot to better illustrate. I circled the area I'm talking about.

What's the problem? How do I avoid it, and how do I fix it now?