In my spare time I've been practicing hard surface modeling in ZBrush (a lot of fun actually), with the main reference from awesome work of Scott Robertson. During that time I was watching master classes from Vitaly Bulgarov, Maciej Kuciara, Alex Figini, Learn Squared and book from Scott Robertson (and other books), final comprehension from that was to finish it to the end with textures and rendering. Zbrush - Substance Painter - Cinema 4D More stuff: https://www.artstation.com/artwork/9Y5Jy