Having an impossible time drawing recessed canyons and valleys
I can't draw worth a damn but I'm trying to make a world map for a project I'm working on. I started with Star Raven's delightful cartography brushes and then discovered that I could, actually, sort've mouse out additional terrain features as required, which is what I've been doing in areas like deserts or swamps or what have you.
The map's pretty big but I'm having problems with one main part - the canyons. I just can't wrap my head around the thatching and how to illustrate the things.
The map I'm working on needs a web of canyons right around that area of the map, but I have no idea how to draw the recesses properly. I've combed around here for any examples, but I've not found anything really close enough to use as a reference.