Sister's Lab - WIP page

Here is a work-in-progress image from the book. I have just started playing with some digital color on the butterfly shadowbox and space poster but I am sharing my drawing pre-coloring to show my process.
The girl on the stool is composited on top of the room. They were separate drawings aligned using a light box. All the perspective and straight lines were a little time consuming but I had fun putting this one together.

This is the protagonist's older sister who is a budding (or perhaps a full-fledged) scientist and inventor. Let's just say that her alibi has something to do with her regimented lifestyle.