I usually draw from memory, but for this exercise, I started looking
at references. The sketch below was the result of looking at several
different kinds of WW2 fighters, including the Mosquito (one of my
favorite aircraft designs of all time), the P51 Mustang and a couple of
others.
The end result is still a little conventional, but
looks more interesting than my earlier attempt. Or not. ;-) Still need
to work on my perspective (click image for larger version).
Until now, my sketches have been small, about 6-8 inches in length. I'm
going to try a larger size for my next sketch, see if it helps improve
anything. And my markers are drying out, so it's time to get some new
ones :-).