Yes, I got that book a few days ago! I will look at it for the shading part, I always had problems with that. thank you for your comment!
Here is some new work. Done in Photoshop, grayscale. the initial sketch was done in photoshop as well.



and the current WIP i’m workin on which I’m trying to make a bit more realistic than the previous
this is the line art I did on paper

here are parts of the painting, I’m having trouble blending…





























