Incorporated reference observational sketches

I think, after slogging through two graduate programs searching for a way to use reference in my process, I've finally successfully intergrated line drawing from reference observation into a finished piece, actually two. These were for a job I worked on this week. The sketches were done in my normal stylized method without considering the use of the reference drawings. But in the middle of making the devil image, I dropped in the bus drawing and then cut and pasted other bus drawing elements to fill it out. The top image is for a story called "Unknown Quanitity," playing off the phrase "the devil you know," this person representing "the devil you don't know." The bottom image was done just after the top one and is a standard gear-head concept for a story about re-educating or re-setting clients.