Hey GLS

This is just a really CRAZY idea, and please totally ignore it if it's just not the direction you want to go in with this map (even though I half suspect you were going to do this anyway...

Just a thought - if you lighten up the tones of the land by quite a few shades you could almost make it look like the bone to go with the ocean of blood - yellowed bone - tans, a touch of dirty greyish yellow/orange, fawns, and warm greys... and any forests or vegetation could be done like the ocean colours, but slightly darker- like freshly clotted and slightly browning blood stains left high and dry on the land?

This is just a sample palette I took from a skull picture just to show you how close the colours of bone already are to your land mass colour

Click image for larger version. 

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Like I said - this IS just one of my totally crazy momentary thoughts! And it's very much my bad if this disturbs your own creative processes on what you're doing here