Slag Plant Concept Designs - Stage 2

Im currently Working on a new portfolio project creating a slag plant that would fit into a world - this is step two out of my process, creating line-art and form to plan out a design for a particular plant, mapping out different options and ideas before i choose at least 3 to fully render in painting and model at least one.

I Accept any pointers, comments, crits, a thoughts on options to help me in my process as i continue