Good drawing and rendering skills can be aquired by anyone who is prepared to take the time to carefully observe.... Shading and rendering a sphere
Drawing an object in direct light: learning highlight, halftone, core shadow, reflected light, and cast shadow.
Realistic render with an effective communication of materials and surface texture.
Drawing Glass - WetCanvas
Learn How to Draw Glasses on a Man's Face from the 3/4 View (Three Quarters Angle)
Design Sketches | HakanGursu
Eyewear/Glasses Reference by Boogol.deviantart.com on @deviantART
포항창아.시대정신미술학원 건전지 기초디자인 개체묘사 개체표현 색채정밀
Sketches & Roughs on Behance