First thing I love how this is not a usual fractal image it reminds me some sort of room from a video game or the place where I want to be buried. The use of perspective to create depth is executed very well. The color choice is great lots of warm colors and then you throw in some cool colors on the top or what I call the ceiling.
The gray webbing that you use which complements the other piece is a nice touch as well. I like how it blends in with the brown on the left side of the image. Really a nice piece of work.
it looks very interesting structurally and lovely light... as ever I struggle..took your advice/settings for finding the tunnels but haven't got there yet .. it's like when I went looking for your burning ship, lots of nice things but never what i'm looking for.. i'm pants at understanding mb3d