I'm going to risk commenting on this, even though last time feedback was sought for this project I feel like very little of the feedback actually made it back into the art.
So, when I look at this, I am confused. Visually, I can't work out what is higher and what is lower. Something that can help with this is shadows - in fact I don't know how you are going to do this without shadows. My point is - at the moment it's a mix of texture but even looking at it carefully, its hard to decode. You need to pick a light source direction and apply it consistently.
I think this was the most confusing part of the image for me:

I've added a couple of shadows based on what I can only guess is your desired light source direction:
