/ic/ - Artwork/Critique

Thinking about trying 3 different papers for pen+ink.
Tomoe river paper
>mainly see it used for caligraphy but looks like it could be good for ink drawing
Deleter paper
>mangaka use it so how could they be wrong
Rhodia paper
>I see hipsters using it a lot
Anyone have any input on any of these?

Does grinding certain subjects individually help drawing overall? I've been improving gradually but I thought "oh, maybe if I do 20 sketchbook pages full of human ears I'd be a master at drawing them, and can apply that knowledge to my work" and so on with other things.

Has anyone tried this method? Instead of studying whole images, you just repeat certain pieces?