A tutorial for how I personally paint grass. I also sometimes paint fur in a similar manner
I usually use the 4th nib, but accidentally used the 3rd for this tut. Either should work well, depending on your personal preference.
ALSO, this isn't a technical issue with the tutorial, but I forgot to mention that backgrounds should become more desaturated the farther back that you go. Keep this in mind when drawing things far away vs close up.
ALSO, if you do not have "noise 2" or "watercolour 3 pt" then just substitute for what you do have. I am not entirely sure how I acquired these extra settings, as I have downloaded multiple user-made custom brush things for SAI. It is possible that these setting came from here-- [link]
-- yet I am not 100% sure.
But I do not think that there is a significant difference, if any at all, between noise and noise 2.
Painted on SAI.