hi danno.

i tend  to use the double plane approach to get the basics then i delete the planes and work to a portfolio of pics on another machine so that i'm not swapping screens all the time. what i have found is that no matter how much i do, i can always find more to do lmao.  i also realised that useing a plane doesn't always give a true representation. the pic only has to be a little slanted on the vertical and you end up with trying to achieve the impossible, i spent hours on the the nose where it meets the top of the lip to no avail.  it was only when i realized that length and  depth change as its tilted forward or back that i was able to let go with trying to perfectly match the pic.

 

billy