Reading Rock: Shape Before Texture
Okay. New module. We spent two modules on sky and on getting your values and color temperature to separate foreground from background. Now we're going to point that at something specific: rock.
I want to be upfront about why this is its own lesson before we touch a brush loaded with texture tricks. Because that's where everyone wants to start. They see a canyon wall covered in streaks and pockmarks and lichen stains and they think the painting is about reproducing all that. It isn't. Not yet, anyway.
The painting is about the shape of the rock first. Texture is what you get to add once the shape is already convincing. If the shape is wrong, texture doesn't save it. It just makes a wrong shape busier.
What I mean by "shape"
Rock isn't smooth like a river stone and it isn't random like a cloud. It breaks in planes. Flat faces that catch light, and edges where those faces meet and go dark. If you've ever stood at the bottom of a canyon wall and squinted at it, you've probably noticed it reads almost like a low-poly version of itself. Big shapes first. The detail is just decoration on top of those shapes.
So before you think about texture, you're doing two things:
- Find your two or three biggest value shapes — lightest face, mid face, darkest crack or shadow.
- Get the edges between those shapes right. Some edges are hard (a crisp break in the rock). Some are soft (rounded, weathered stone). That contrast is doing more work than any texture you'll add later.
The exercise
Grab a scrap sheet. Not your good paper — I actually think cheap paper is fine to learn shapes on, it's brushes I get picky about. Pick a rock reference, real photo or from memory if you've been up the canyon recently and have something in your head.
Step one: pencil in three or four big shapes only. No detail. Just where the planes are.
Step two: mix one mid-value wash — doesn't matter exactly what's in it, I usually end up with some kind of grayish brown, burnt sienna and something blue, I genuinely couldn't tell you the ratio most days. Lay that into your darkest shape first, wet-on-dry, and stop. Let it sit.
Step three: while that's drying, mix a lighter version of close to the same color and lay in your mid shape. Leave your lightest shape as bare paper or a bare wash. Don't touch it again.
Step four: once everything is bone dry — and up here that's usually fast, but give it the full time anyway — go back in with a small brush and just define the hard edges where planes meet. That's it. That's the whole exercise. No texture at all.
You'll be surprised how much this reads as rock already. That's the point I'm trying to make before we get to the fun stuff next lesson.
Where people wreck it
Everyone wants to jump straight to texture on a wash that isn't dry yet, and I get why, it's the appealing part. But here's the thing that'll bite you if you rush it.
I ruined a good sheet years ago trying to lift out texture with a dry brush before the wash underneath had actually set. I thought I was being efficient. The air here is dry enough that a wash can look dry on the surface and still be locked in underneath, and when you go back in with a dry brush trying to scrub out a lighter shape, you just drag pigment around and scar the paper. It didn't lift clean at all. It came up as this dull gray smear that didn't look like rock or cloud or anything. That failure is basically why I'm this strict about waiting now. Let it dry completely, then decide what you're doing next. Not "seems dry." Actually dry.
So: patience on the drying, restraint on the shapes. Texture is a topic for next lesson and it deserves its own conversation, because there's a right way to add it and about six wrong ways.
One caution
If you're working from a rock reference you shot yourself, up a canyon somewhere, be honest about how much detail is actually in that photo versus how much your eye filled in when you were standing there. Photos flatten shadow detail more than you think. That's not a technique note, that's just a "don't trust the photo completely" note.
Before next time
Do the shape exercise twice — once loose and fast, once slower and more careful — and bring both. I want to see which one actually reads better as rock, because it's usually not the one people expect.