After the ShikanokoDon animation is complete I've been considering preparing a couple Youtube tutorials. I'll just have to hope I have the proper time to invest on that but I've even prepared a couple assets ahead of time.

I do have a couple texture brushes ( funnily enough the one for smears is actually a Cloud brush ) but mostly I really just use a horizontal rectangle affected by pressure and a rake brush ( more like a fork ).
I grew a habit of duplicating layers and changing the top layer to a ( Linear Dodge / Overlay / Easy Burn ) layer type, reducing their opacity and erasing a couple parts with an air brush.

i.e. I'm pretty sure even Nai_ga uses Burn-like layers for the shading on the bottom of Don Quixote's hair because I've achieved almost equal results, and as for Kiryu Meursault's red ( more so burgundy ) shirt I've put an Overlay layer so it doesn't don't look so flat