How I create a custom illustration

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I've realized I don't talk much about the custom illustrations I do.
I'm not even sure if this is the right way to refer to them. Basically custom illustrations are pieces people commission me to do mainly for personal use or to offer as a gift. 
Whenever I have a request I always try to find the time to do them. It's such an honor to be asked to do these works that I always try to do my best to be deserving of it. Which usually means it turns out to be a very time-consuming process but I'm always very pleased with the result. And my clients too, at least that's what they tell me :)
I did this piece two months ago but only had time to edit the footage now. I tought it could be interesting to share with you a bit of the proccess of doing this kind of work.