It's only this smooth when I use the pencil tool on my chromebook. It's a touch screen with a pen so I get to draw right on the screen and let my hand rest against it so it really helps.
Not seelmaru's style, if it were I probably would have been more accurate and less cartoony with the anatomy.
But I'll take that as a compliment since she's the only artist/animator I'm still subscribed to from my animation meme phase.