This is really wonderful! I love how the island is so tiny and unassuming, yet underneath...

Both versions look great, but the coloured one is definitely my fave. Just one crit, though... I would suggest unblurring the animals/creatures. I'm assuming you did that to show that they're further away (DoF blur)? But to my eye, it looks a bit odd and doesn't convey that very well. I think it would look much better with everything sharp and crisp.

I was wondering, how do you access the cavern in the middle and the bottom-right? And what's stopping the bottom section from flooding?