/ic/ - Artwork/Critique

what do you guys think? I tried to "think in 3d" and do construction while challenging myself by drawing something that has very little straight lines but it was hard. I think I did too much contour drawing here, but it's better than some of my earlier attempts at similar refs.

I know it's super chicken scratchy, trying to work on that but I get so focused in thinking about the next line that i forget to not draw from the wrist.

I'm about halfway through perspective made easy, but I'm thinking about getting Robertson's 'How to Draw' for more in-depth stuff, would u guys think that would be helpful?