You have really great work, and I don't think I could ever reproduce your sort of detailing. I just felt I shouldn't be the only "Yes, man" here and be a little critical. Feel free to criticise my work after.
There is just something off about that structure in the center. It is similar to the bottom of a skull with a strange crooked spine coming off of it. I think the whole piece would have been amazing without it; it seems out of place... even in the smaller part of this fractal-like design.