Stain glass mosaic

I create stain glass mosaic on glass however, I cannot draw a straight line. I'm looking at creating a design that will be installed in an antique fireplace surround where a mirror would normally be. I have pictures that incorporate different aspects of the mountain drawing I need, dreaming of talent to bring the ideas together. The stain glass mountain picture looks great but needs different mountain lines similar to that in mountain 2 examples. The final glass opening will be approximately 32" wide by 19" tall. The drawing will need to be sent in an electronic file format to allow me to size and print and place under my glass to create the final art piece.