Nice drawing Tomas. I would suggest that you start your drawings with simple shapes, then build your drawing on top to make it look more 3 dimensional. I did a quick sketch to show you what I mean.

Hey @tinel32 what's the confusion? I think you did a nice job here! My only real critique would be to evenly, and fully fill your shapes with value, edge to edge. You can see around the cool texture you've given the hair a bit of a halo effect where the value doesn't extend to the edges of your shape, which doesn't fully define your shape visually. Hope this helps!