/ic/ - Artwork/Critique

Hello /ic/, /gd/ here. I am trying to start applying textures to my illustrations but I can't wrap my head around it. Most tutorials I've gone through explain how to use textured brushes ,noise filters, overlays and the likes on top of your artwork, and these are things I know how to do. But when I see some artwork like pic related, understanding how the artist did it or how to recreate this effect is beyond me. This was supposedly drawn in photoshop and procreate. It looks completely organic and doesn't have this faux traditional finish that most tutorials teach.

Does anyone have any tips on how to achieve this?
How do you texture your work?

>inb4 hard round is all you need
I use hard round for practicing blocking and values, but sometimes you just have to use textures.

link to artists behance in case someone needs more reference
https://www.behance.net/hokyoungkim_