My first attempt at drawing moving water and I can conclusively state it's HARD! I got better as the drawing went on but obviously still have much to learn.
Smooth A4 bristol board, a mixture of 0.3mm/0.5mm mechanical pencils from 6B to 2H and a couple of wooden HB/2B pencils. The black background was mostly completed with my new toy, a 2mm 6B clutch pencil. That sucker shades FAST!