How to draw loose - Here are a few ways that work for me
I this video, I was using:
Cretacolor Megagraphite 9B (I couldn't find a link. But I got it from Artfriend in Singapore)
DaVinci Vario tip brush (this is an Amazon affiliate link*)
Speedball Steel Brush (this is an Amazon sg affiliate link*)
Long hair brush - I was using a Daler-Rowney one.
*This means I get a small commission for purchases through this link. But at no extra cost to you.