December step by step (Patreon)

Sketch

Better sketch

Lines

Figuring out a colour scheme

 Colours. I started with flat colours, all on one layer, then added new layers of top and painted on those layers.

I used the 'select colour gamut' option in CSP to just paint over the area the coat takes up, because I saw a tutorial about this recently. I quickly decided that I prefer my normal messier colouring where colours from one area overlap into other areas.

More colouring. Note the colours overlapping from coat, to fluff, to vest etc. I do like messy colours.

More colouring. While the base colours for Wisteria were all on one layer, I used many, many many layers to add the shading (the shading layers were locked to Wisteria's base layer)

The snow, and the branches were done separately. 

Final details - colouring lines, increasing contrast etc.