How to make pixel art in Minecraft Pocket Edition is really simple. All you need is the app and a pixel drawing.
Step 1: Get a Picture (optional)
This step is the easiest because all you do is go on google (or any other web browser) and search 8 bit. I chose Mario and Shy Guy for this tutorial. I cropped the screenshot I took to make it easier to see.
Step 2: Get Building!!!
In this step you take the picture and make it block by block in Minecraft. First find a flat place to build your pixel art then copy the pixel drawing onto Minecraft. One block equals one pixel. The blocks for the Mario I did were green wool (not lime wool), orange wool, and red wool.
Step 3: Shy Guy
In this step we'll make Shy Guy in Minecraft except I'm doing it layer by layer, so you can do it with me. When you're done, yours should look like mine.
Step 4: Do More
Now you know how to make pixel art in Minecraft. You can make more pixel drawings and more complicated ones. Just have fun!