Hey there!
In what file format do you need the final delivered in? My process would be to do this by hand, then digitize it. First I would provide you with sketches for you to approve of, then start with the detailing and coloring.
If you initiate the chat I can send you some *watermarked* sample illustrations.
Anyway, I could start working on this right now, just let me know!
I'm well experienced with both photoshop and illustrator, having worked for several years as an art director in advertising agencies.
Please check my profile for my feedback and rating.
Cheers!