Hi Steemians! Very funny idea of 
The whole process basically consists of:
Step 1 - Draw a sketch
Step 2 - Paint the basic colors
Step 3 - Apply some shadows (I use a separate layer with the Multiply effect - found in most image editing software - and a soft brush in gray color)
From there I do some adjustment and BAM, a cool guy who loves to feel the freedom of the wind blowing in his hair!
I hope you like it, thank you!!