Sketch + Lighting Tip (Patreon)

I'm starting a doodle for a Draw This in Your style event. Maybe you recognize the character! :D

As you know I'm working on the webcomic and commissions so I don't have the enough time to draw great things, so most of my recent post in Instagram are basically portraits without backgrounds. I always try to compensate this lack with a curious and striking lighting. 

So here is the tip.  
Theoretically, the first thing to apply in a drawing is light. The shadows are defined from the light. That's why, although the last thing I add in my drawings is lighting, I always try to make a sketch that represents how light works. This way it will be easier to understand shading :)