1. Create a new Web document. Name it the letter you chose.
2. File > Place a high resolution image of an image of your choice from google (search tools>size>large)
3. Set your fill to none and stroke to white and .25 weight.
4. Start creating triangles with your pen tool that connect at the edges. Make your triangle sides overlap so you are not adjusting so much at the end. You choose the size. Tip: try and create the triangles around areas of color. The smaller the triangles, the more detailed the picture.