Thanks for the comment, Not quite sure how to answer your question but I'll have a go.

I use sketchbook pro with my standard canvas set to around 3000x3000 pixels at a resolution of 300 pixels/inch. I start by using a brush tool to create the shapes, relatively unrefined. I then refine those shapes by blocking in the different colours e.g. the green for the dinosaur or the red for his arms. after its all been coloured I add simple shading which I blend later using the dry brush tool. I then add more highlights or shading with the airbrush tool before finally using the pencil tool to add little details here and there.

TL:DR - Shapes -> colours -> shading -> Airbrush -> Final few details

EDIT: also I am using a graphics tablet, Medium Intuos Pro, but any wacom tablet would work.