Darth Vader.
The hard part about this artwork is the complexity of the shadows. Once you get the hang of it everything will be easy.
Difficulty Level: Hard
Materials Used:
1. Wacom Tablet
2. Photoshop
3. A photo of Darth Vader for reference 
Step 1
Sketch the pose and basic shape of the character using the paintbrush tool with a pencil type tip.

Step 2
Continue Sketching.

Step 3
I kinda messed up my layering here. I usually have different layers for the pencil, ink, and colors so erasing will be easier. Anyway, ink it and ad shadows.
Also if you noticed my scribbles at the side, this is another separate layer where i test my brushes if it’s the right color and size.

Step 4
Add shadows and detail. Don’t forget to create another layer for this and put it under the ‘inked’ layer of your work.

Step 5
Clean up. I erased the scribbles at the background and pencil guides. Done!
