The past few chapters I had been using the beginning locations as the start of the chapter, but considering that there's a lot of different locales that appear in chapter 6, that wasn't going to work nearly as well this time. I decided to do a more evocative cover, so that meant I had to think about it a little more. Here's a thumbnails and color tests I ended up doing before reaching the final result.
There were actually quite a few more thumbnails than this, but they were pretty small and scribbly, so not exactly easy to see what was going on.