I was taught to use the grid method in elementary school and was amazed
at how simple it was to use. Unfortunately, I was under the impression
that using a grid was 'cheating' so I never used it again. Years later
I went to an exhibit of Vincent van Gogh and was astonished to see that
he and many other masters used the grid method! Well that was good enough
for me!
I decided to give the method another try. I drew grid lines, 1 inch apart,
with a permanent marker onto an sheet of acetate film. I blew up my reference
photo to the size that I wanted and placed the acetate over top. I then
drew grid lines with an F pencil onto my drawing surface. While this worked
very well, I was spending too much time drawing and erasing the grid lines.
I now blow up my image to a size that I am happy and print it off. I then
print a grid that I created in photoshop (you can also use a word document)
directly overtop of the printed image. 
Then I print the same grid onto a piece of regular copy paper and draw my
initial sketch on the copy paper.
Once I am happy with my drawing I use a light box and transfer the drawing to
my drawing paper. Originally I used my glass
dining room table with a lamp underneath or a window which actually worked just as well as the lightbox. If I have a hard time seeing the lines, I will go over
them with pen so that I can see more easily.

This may seem like a bit of work, but if you have ever used the traditional
grid method only to be dismayed by grid lines showing through on your
final drawing, the work seems minimal in the long run. Also, I found that
drawing my grid lines manually often led to slight discrepancies between
the grid on the picture and on my drawing. Small discrepencies turn into
big discrepancies when you are working on a portrait!
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