Fantastic Voyage: Thumbnails

Here are my rough ideas of the environment so far. I'm finding it hard to draw the environments without being at least 80% sure of the story, but drawing out the environment actually helped the story development. Sigh..

Here we can see the mitochondria (top left), nucleus wall & pores, the RER and SER. I need to add some sort of pathway for the character to make it from the start to the goal (inside the nuclear walls)

Ribosomes and lysosymes. The lysosymes have  scanners search out for chemicals etc. (And the guy inside!)
I want to figure out what sort of matte paintings I can have in the background to frame everything. I need it to seem mechanical yet somehow organic. These thumbnails don't feel like environments because of the lack of background