cheers,
Nate
(tip --- using a big brush helped me to sketch very loosely, sketching squares and triangles and circles and combinations of them helped me to sketch in a simplified style -- not stopping between doodling but instead taking screenshots of doodles as go along helped me to stay loose and quickly put the drawings together onto one page -- thinking of drawing digitally like having sketchbook with lots and lots of paper to play with was helpful)
