Hmm. Shouldn’t it get darker the closer you get to the water?
I don’t have a lot of experience with bogs etc. My first thought was something bright green but I remembered the peat bogs on my island (Lewis) & looked into it. Many are ‘anerobic’ ie lack of oxygen & some fairly strong chemical compounds from rotting vegetation so I thought I’d do something looking a bit dead. The pools are brown: peaty. I thought they’d be a focus for dead vegetation: hence the ring of dead grass etc.