I’ve written up a couple of tutorials before on drawing isometric mountain ranges for fantasy maps – but never more than the pen and ink stage. I’ve had a few requests for how to take this to the next step and colour the mountain ranges.

Note that I use a graphics tablet. You can do this with a mouse and low opacity brushes, but tablets are getting good and relatively cheap. I’d recommend picking up something like the Bamboo Splash if you’re going to be playing around with illustrating maps.

Here’s a quick walkthrough of the four steps I take in my mountain ranges.

1. Illustrate the lines for the mountain range

First off – we always need some solid line art to underpin our mountain range. Here’s the tutorial on the steps I take when I draw up a new mountain range. Note that here I’m using a mid tone textured background. You can either create your own, or grab this one from here.

2. Block in the basic light and shade on an overlay layer

Here I’m taking light to be coming from the top left – so the right hand side of the mountain range is in shade. I add a new layer, and call it my light and shade layer. I pick a hard round brush, with opacity set to pressure (so when I press hard I get a dark line, but if I press softly I get a very light grey line). I use black as the colour, and I set the blend mode of the layer to Overlay. If you need a refresher – here’s a quick tutorial on blend modes in photoshop and gimp.

I block in the basic shadow with a large round brush. Then I go back, with successively smaller brushes, to build up deeper shadows. Note that there’s shadows on the mountains that face the light too. Also – the deepest shadows are nearest to the crest of the mountain ridge. Don’t be afraid of hard edges here – shadows on mountains have very hard edges (unlike hills). Here’s a good example, but google images is full of great reference images for mountain shade.

3. Add in detailed light and shade on another overlay layer

Our mountains still look a little flat, so I create a second overlay layer. Here I use a smaller brush with the same settings as before. I add more layers of shadow to the crevasses on the far side of the range. I also use a white brush to add highlights – both on the side facing the light, and along the crests in the shade. The sun will catch some peaks, edges and crests on the shaded side. This helps to pick out that detail, and avoids having just a boring black and white divide on either side of the range.

Again, the lightest points will be along the crest of the mountain range.

4. Add colour on a colour layer

Our mountain range is looking good, but it’s very yellow. Create a new layer, and set the blend mode to colour. Pick a very desaturated blue (a bluey-grey). I use my pressure sensitive hard round brush with low opacity again. Build up layers of colour to pull the mountains back from that yellow colour above. I add some more saturated blue into the shadows to make it a little more interesting.

And that’s it! Job done – we now have a fierce looking mountain range that can divide nations, hold dwarven tombs, or be the hunting ground of an infamous dragon.

And, if you want to see the full process, here’s a video walkthrough for this illustration: