I keep wanting to stop and draw everything, but it's way too complicated to sketch quickly, so I took some reference photos, like this one. I love how it looks like a beardy old man - well, alien - and the raindrops make an eye and a sort of crown.
When I got back to London, I made an ink study from the photo:
I'm not sure it really works as a picture, but I had fun doing it and learned a lot about the textures and patterning.
Oh look, there's a tiny Philip Reeve down among the mossy rocks!
Ah, it's not Philip, it's his 1/48th-scale action figure.