"Did [ I ] use much colored pencil?" Good question and my initial response would have been 'no' until I prepared the markup below to help answer this. Now I'd have to answer 'yes'.
A word about the 'process': with the exception of the reflected shadows and 5 'white over yellow ochre' areas, all colored areas started out as graphite sketch > sepia ink outline > colored pen & ink. However, the result was rather flat.
Additionally, although dark pen & ink 'highlights' could be successfully added, lighter [pen & ink] colors - such as the light blue highlights on dark areas of the leaves - would be difficult to see without better preplanning. "Better preplanning" would, of course, eliminate the surprise at how the work turned out. (It also would mean I would need a better understanding of what I was doing.) I know somewhere there are artists who know exactly how their finished work will look before they start, but with me the end product is always a surprise.
So, that's the reason the (1) 5 'white over yellow ochre' areas were left blank and (2) colored pencil was used to give some depth to the work.
And colored pencil shading/highlights are much quicker to add.