It's of my angel OC Goodie, he's not a bad guy, just a little mischievous... in this drawing, he's collecting stolen precious items from the demons, including a time inverting pocketwatch, much to the dismay of the demons and amusement of the young angels!
Digital, I use Paint Tool SAI and to get a soft/smooth look I paint lighter and lighter shades and then use the blur tool for colour blending! You can see a quick example of this here!