Hey, pixel art is basically placing pixels in the right spot to create a image pixel by pixel.
Some artits draw it, trace it, and color it. I'm guessing you can do the same thing, if you're going to draw a hat on photoshop do the following:
1.Draw it
2. Resize it to the template
3. Trace it with a 1 pixel brush.
4. Finalize your outline, make sure theres no jagged lines.
5. Color and shade it!
You can resize your brush by the way, just set the size to one pixel.