My drawing after I finished this amazing class

My drawing after I finished this amazing class - student project

Hi Jonas !
This class is amazing , I just finished although I am unable to completely understand the 2nd mask layer you worked on. The way you paint over the textures and it shows up from the drawing layer, can you please give me a hint. BTW here I did after I finished the class...
Thanks and keep up the great work

Maruf Hasan
Digital Artist