I had the chance to paint a Planeswalker for the Amonkhet release of Magic the Gathering this year. The painting is titled Nissa, Steward of Elements. Here are some of the steps:
Once the sketches are done I start making and gathering reference. I used Blender to build the model of the background and my wife posed for Nissa using loose cloth and dish towels.
Once that is finished I can do a tighter drawing, at the same size as the final painting.
Before I start the final I will usually do a color study, either on the computer or in oils. Sometimes both. In this case I did both.
Onto the final image!
Here is a time-lapse of the color study:
And of the final: