Grid technique - Cheating or Acceptable.

[MnM]

I recently saw a technique called grid technique. It is done as follows - Overlay the image to be drawn with a grid. Next construct a proportionate grid lines. And use the grids to draw the image to get almost precise drawing of the photograph or whatsoever. Doing this traditionally is a bit time consuming but, digitally, its very very easy.

I have done this using that technique. Even though its a bit rushed, you can very well identify who that person is.

Reference Image (Click to View)

Drawn image (Click to View)

This technique has eased my job. I want to know whether this is cheating or it has already been practiced.